Devil's Millhopper State Geological Site
Lonely Planet review
As the name indicates, this is not your average park. The site centers on a 120ft-deep, 500ft-wide funnel-shaped rainforest which you enter by descending a 232-step wooden staircase. Water trickles down the slopes from the surrounding springs; some of it flows into a natural drain and ultimately to the Gulf of Mexico. Rangers lead tours every Saturday at 10am. The park is about 20 minutes northwest of downtown by car.