Lignumvitae Key State Botanical Site, Islamorada

This key, named for a hardwood known as the "wood of life," is accessible only by boat. Its undeveloped land includes a variety of plant species and in them birds such as the brown pelican, ospreys and migratory warblers build their nests. All visitors must participate in a ranger-guided tour; visitors aren't allowed to wander around on their own. The tour fee is $1 per person, children under 6 are free. Contact the Long Key State Recreation Area in advance for tour information. Tour times are subject to change.