American Chestnut Land Trust guides you out on Parkers Creek, where you’ll paddle thru waters in swamps to coastal salt marsh on this pristine freshwater stream. Bring water and a snack. Be prepared for a strenuous three-hour paddle; you may have to help carry the canoe. 3-6pm at Warrior’s Rest Sanctuary, Scientists’ Cliffs Rd., Port Republic. Suggested donation $15/person; rsvp: 410-414-3400; www.acltweb.org.