Cayo Costa is a beautiful island, accessible only by boat. There is a ferry service, the Tropic Star, that makes multiple trips from Pine Island to Cayo Costa. There are multiple trails throughout the 2,426 acre park, not to mention just walking on the white sandy beaches along the Gulf of Mexico.
Gasparilla Island-Boca Grande Trail is a 6.5 mile point-to-point trail located near Boca Grande, Florida. The trail is good for all skill levels and primarily used for fishing, mountain biking, trail running & walking.
Sanibel Island is a 50 mile out and back trail located near Sanibel, Florida that features a river and is good for all skill levels. The trail offers a number of activity options and is accessible year-round. Dogs are also able to use this trail but must be kept on leash.