WALKING THE ESTATE
Take a one-and-a-half-mile hike through tropical hardwood forests and across one of the last existing Tequesta Indian burial mounds. 12:30 p.m. Daily. Deering Estate at Cutler, 16701 SW 72nd Ave., Palmetto Bay. Free with park admission. Details: (305) 235-1668 or www.deeringestate.org.
Join Castellow Hammock Nature Center's naturalists for a guided night hike to see what creatures lurk in the park at night. 7-8:30 p.m. 22301 SW 162nd Ave., Aladdin City. $6. Details: (305) 242-7688 or www.miamidade.gov/parks.
The Deering Estate hosts an evening canoe trip across Biscayne Bay to Chicken Key. 7-11 p.m. Deering Estate at Cutler, 16701 SW 72nd Ave., Palmetto Bay. $40. Details: (305) 235-1668 or www.deeringestate.org.
Join Deering Estate naturalists for a nighttime prowl of the estate's grounds and see what comes out after the sun goes down. 7-9 p.m. Deering Estate at Cutler, 16701 SW 72nd Ave., Palmetto Bay. Details: (305) 235-1668 ext. 233 or www.deeringestate.org.
The University of Miami hosts a celebration in honor of Charles Darwin's 200th birthday as well as a tour of the John C. Gifford Arboretum. 6 p.m. The University of Miami, 1201 Stanford Drive, Coral Gables. Details: (305) 284-5364 or www.bio.miami/edu/arboretum.
The Crandon Golf Club hosts the fourth annual Celebrity/Amputee Golf Classic benefiting Shake-A-Leg Miami, which provides vocational training to wounded and injured veterans, and the CARMA Foundation, which provides aid to children and women in Haiti. The two-day event includes a VIP-pairings party and auction as well as the chance to play with a celebrity or a veteran during the tournament. Ends April 24. Details: (954) 864-2478.
FUN IN THE SUN
Virginia Key Beach Park hosts the "Fun in the Sun Youth Festival" for children ages six to 17 and their families. The day will include karaoke and Dance-Dance Revolution contests, Wii-fit video games contests, scavenger hunts, a fresh farmer's market, aquatic adventures, cooking demonstration, recycling crafts, rock-wall climbing and giant water slides. 9 a.m. Virginia Key Beach Park, 4020 Virginia Key Beach Drive, Virginia Key. Details: (305) 960-4600 or www.virginiakeybeachpark.net.
CLEANING AND GREENING
Help restore the natural areas of Miami-Dade County by removing exotic vegetation, restoring native vegetation, enhancing trails and conducting clean-up activities. Volunteers will be taught to identify invasive plants while learning about South Florida's ecosystems. 9 a.m.-Noon. Kendall Indian Hammocks, 11345 SW 79th St., Sunset. Details: (305) 372-6687 or www.miamidade.gov.derm.
Take a boat ride with the Historical Museum of Southern Florida's Paul George to see the Cape Florida Lighthouse, Stiltsville and learn about Key Biscayne's history. 10 a.m. Bayside Marketplace, 401 Biscayne Blvd., Miami. $39 museum members, $44 others. Details: (305) 375-1621 or www.hmsf.org.
YOGA BY THE SEA
The Barnacle Historic State Park is hosting yoga classes. Yoga teaches students to align their breathing with their posture, increasing physical and mental energy. Classes are held on the lawn opposite Biscayne Bay. 6-7:15 p.m. The Barnacle Historic State Park, 3485 Main Hwy., Coconut Grove. $13. Details: (305) 442-6866 or www.floridastateparks.org/TheBarnacle.