Tuesday - 5/6 - Hammock Trails at Gumbo Limbo Nature Center, 1801 N. Ocean Blvd., Boca Raton. Explore this rare remnant of coastal hardwood hammock, and get a glimpse of the past. All ages. Children under 18 must be accompanied by an adult. Meet at the boardwalk entrance. Held Tuesdays & Wednesdays. 10-11:30 am. Free. 544-8605 or www.gumbolimbo.org.