Brian Rapoza leads car-pool trip to Marco Island's Briggs Nature Center. 6:30 a.m. Meet at east gate of Doc Thomas property, 5530 Sunset Ave. Details: (305) 666-5111. METEOR WATCH & CAMPFIRE
Watch early Leonid meteors. Organized by the Southern Cross Astronomical Society. 8 p.m. Lights, litter, pets & alcohol prohibited. Bill Sadowski Nature Preserve. Details: (305) 661-1375. VOLUNTEER WORK DAY
9 a.m.-noon. Kendall Indian Hammock Park, 11345 SW 79th St. Details: (305) 257-0933. KEY BISCAYNE SUNSET CANOE TRIP
Naturalist from county parks department serves as guide. Ages 18 & up only. Reservations required. $20. Crandon Park Marina, 4000 Crandon Blvd., Key Biscayne. Details: (305) 662-4124.
DEERING ESTATE NATURE WALK
Emphasizing the botanical and geological features in the 420-acre park. 8:30 a.m. Meet at visitors center at park entrance, east of Old Cutler Road on Southwest 168th Street. Details: (305) 666-5111.1375.