Free one-hour guided nature walks down one of six different trails are offered each Saturday and Sunday, except holidays. Visitors on the hikes will be absorbed in the abundance of history, natural beauty and the complexity of the ecology not immediately apparent to the casual beachgoer. Emerging from the wealth of bird life, sea life, wildlife and plant life is the majestic tapestry called Fort De Soto Park. 10 to 11 a.m. Fort De Soto Park, 3500 Pinellas Bayway S., Tierra Verde. (727) 552-1862; www.pinellascounty.org/park.