Beginners’ Mountain Bike Ride, 5:30 p.m. Monday at Inland Woods/Pine Ridge trails behind Inland Hospital, 200 Kennedy Memorial Drive, Waterville. The Central Maine chapter of the New England Mountain Bike Association is hosting a free skill-building, introductory mountain bike ride; people of all ages on full-size bicycles welcome. Helmets required. FMI: Call 861-3292 or email [email protected] 

Moonlight walk on the Eastern Trail, 7:15 p.m. Tuesday at the Scarborough Marsh. Meet at the Pine Road trail parking lot. For more information, contact Bob Hamblen at 286-3431 or [email protected] Walk ends by 9:30. 

Georges River Land Trust presentation on fish, birds and other wildlife in the St. George River watershed, 7 to 8 p.m. Tuesday, Vose Library in Union. Find out what we can all do to be good neighbors with wildlife. For more information, call 594-5166. 

Youth Field Day, Saturday, Royal River Rod and Gun Club, Fish Hatchery Road, New Gloucester. Gives children ages 10 to 15 the chance to learn outdoor skills in a safe, structured, fun-filled environment. Check-in is at 8 a.m. and activities should finish by 1:30 p.m. All activities and lunch are free of charge. Space is limited to the first 50 applicants. For application forms, contact Lou Haskell at 655-7757 or [email protected] 

Open House at the Penobscot Watershed Eco-Center, 160 Main St., Bar Harbor, noon-3 p.m. Saturday. The center features a 61-foot-long map of the Penobscot River from the bay to the headwaters. There are also wildlife exhibits and handouts about the work of each of the partners in the PWEC collaborative. 

Outdoor program on the healthy fishery of the St. George River and opening celebration of the interpretive kiosk at the outflow of Sennebec Pond, 10 a.m. to 11 a.m. Saturday, Georges River Land Trust and Georges River Chapter of Trout Unlimited. Meet at the parking area by the rock crib dam on Route 131 in Union. The event is free and open to the public. 

Birding Festival, 5 a.m.-1 p.m. Saturday, Aroostook State Park, Presque Isle. $2 for adults, $1 for children 5-11, free for seniors and children under 5. Bring binoculars, guides, spotting scopes, cameras, insect repellent and snacks or a bag lunch. Coffee, hot chocolate, water and hot dogs will be available. For more information, call 768-8341. 

Looking ahead

Trail walk, on the Eastern Trail, 10 a.m. June 20. Meet at the Scarborough Memorial Cemetery parking lot on Old Blue Point Road. FMI: Contact Jim Monroe at 934-3834 or [email protected] Canceled if raining. 

Hunter safety course, Skowhegan Sportsmen’s Club, 6-9 p.m. June 21 and June 23 and 8 a.m.-4:30 p.m. June 25. A 12-hour course authorized by Inland Fisheries and Wildlife. FMI: Contact Russ Corson at 474-5361.

Handgun safety course, Gardiner Sportsmen’s Club, 6-9 p.m. June 22. This class meets the requirement for a safety class to qualify for a concealed firearms permit. The cost of the class is $60; call 441-7870 to sign up.

June Jog 5K, Mast Landing School, Freeport, 8 a.m. June 25. Benefits local recreation and community education child care, scholarships and Port Teen Center. Cost is $15. FMI: 865-6171 or www.rsu5-rce.org. 

5K Ridge Run/Walk, 9 a.m. June 25, to benefit Equine Journeys at Ring Farm in Bridgton. The cost is $15. For more information, call 647-8475. Register online at www.active.com/running/bridgton-me/ridge-runwalk-5k-2011. 

Botanical Studies, 1 to 5 p.m. June 25 at Hidden Valley Nature Center in Jefferson. Dan Townsend will continue the exploration of the center’s remarkable diversity by examining many of the herbaceous and woody plants of forest floor, fields and pond margins. $25 for center members, $30 for all others. Sign up for three classes and get a 20 percent discount. To register, call 586-6752, and to learn more, go to www.hvnc.org. 

Family Mountain Biking Day, 10 a.m. to 2 p.m. June 25, Hallowell Reservoir, Town Farm Road. Join the Central Maine chapter of the New England Mountain Bike Association for some healthy fun exploring local trails. Rides for all ages and abilities throughout the day, bike maintenance and safety tips, helmet checks, pizza, prizes and more. Rain date: June 26. FMI: Visit www.cemenemba.org or call Brian Alexander at 441-6227. 

Sustaining Maine Lakes, 41st annual conference, 9 a.m. to 4 p.m. June 25, Colby College, Diamond Building, Waterville. $35 includes presentations, workshops, exhibits and food. Hosted by Maine Congress of Lake Associations. To register or to purchase raffle tickets, go to www.mainecola.org or call 1-877-254-2511. 

Bike the Eastern Trail, 65-mile ride starts at 10 a.m. June 25 at the Bug Light parking lot in South Portland. Depending on the number of riders, we will encourage a few friends and partners to meet us in Portsmouth, N.H., around 4 p.m. to join us for something to eat and then take us back to Bug Light. We will plan to ride as a group at a relaxed pace. Bring bike in good working order, spare tube(s), helmet, water and lunch/snacks. Sign up by June 22. Contact Mogens Ravn at [email protected], 934-1643 or cell phone 730-1164. 

Youth Field Day at Phippsburg Sportsmen’s Association, June 26, registration begins at 7:30 a.m. at the association’s clubhouse on Route 209. Fishing, archery, target shooting, kayaking and tracking. Children must be accompanied by a parent or guardian. Please sign up at 443-9426. 

Survivor Camp, Saddleback Mountain is offering a four-day camp July 5-8 with “Survivor” winner Bob Crowley. Crowley, along with his assistant, Maine Guide Peter Christensen, will take participants into the woods to teach fire-building techniques, cooking over fires, gathering food, shelter building and navigation. Families, couples and singles are all welcome. Cost is $500 per person. FMI: Visit www.saddlebacksummer.com.

Maine Lobster Ride & Roll will return to Rockland on July 23. Sponsored by the Bicycle Coalition of Maine, the ride will start and end at Oceanside High School, with staggered start times beginning at 8 a.m. Participants may choose from four distance options: 16, 30, 50 or 100 miles. Pre-registration costs $85, with a $20 discount for coalition members. Children ages 12 to 17 pay $25, and those under 12 ride free. Participants will receive Maine Lobster Ride socks. For online registration, a video about the ride and more information, visit www.BikeMaine.org or call 623-4511.

23rd annual Maine Bike Rally, July 8-10 at Brunswick High School. This event features road rides, mountain bike rides and an accredited time trial. Onsite camping, food, all rides, entertainment are all included in an affordable weekend price. The Maine Bike Rally is a combined effort of local enthusiasts, Casco Bay Bicycle Club, Merrymeeting Wheelers Bicycle Club and the Bicycle Coalition of Maine. Go to www.mainebikerally.org for registration and details. 

Ongoing

Cathance River Education Alliance in Topsham is hosting open hours at the Ecology Center from 11 a.m. to 3 p.m. on Sundays in June. Visitors can learn about the center’s green features, explore field guides, animal specimens and geology, or watch footage from a remote wildlife camera. For more information, visit creamaine.org or call 891-8341. 

Maine Guide training programs: July 7-10 at the Penobscot County Conservation Association Clubhouse; July 28-31 at the Phippsburg Sportsman’s Club. The course prepares students for taking the state’s licensing exam for recreational, hunting and fishing guides. The cost is $475, and a $200 deposit is required upon registration. To register, contact Carroll Ware at Fins and Furs Adventures at 474-5430. 

The Kennebec Land Trust Outing Club offers events for active adults age 21 and older. The club is a great way to explore the outdoors, get to know Kennebec Land Trust properties and socialize. Excursions are free to trust members or $5 for non-members. For a schedule, go to www.tklt.org. Call 377-2848 to register for outings. 

Weekly Bird Walk, 7 a.m. Thursdays at Gilsland Farm, off Route 1, Falmouth; $5 for Maine Audubon members, $8 for nonmembers. Bring binoculars and a field guide and meet in the visitor center parking lot. FMI: Call 781-2330, ext. 209. 

Guided trail walks with local Kennebec Messalonskee Trails volunteers at various locations in the Waterville area, offered several days a week throughout the summer and fall. Free; all welcome. For walk locations and times, visit www.kmtrails.org. 

Fundraiser Fridays rafting trips with Northern Outdoors. Every Friday, Northern Outdoors will contribute $20 per person in a rafting group to their designated charity. Groups must pre-register, and each member chooses a designated nonprofit. For more information on Northern Outdoors and Fundraiser Fridays, visit www.northernoutdoors.com/site/groups/fundraiser-fridays.html.