Rainbow river is spring-fed and therefore virtually crystal-clear. The K.P. Hole State Park (US$5 entrance) is very attractive and extremely well maintained. There are lockers (US$2 with US$5 refundable deposit), snacks, toilets, and usually boats that take you upriver for a leisurely snorkel or dive back. We had Captain Brit take us up the river (US$10 each), then did a wonderful 2-hour draft dive back to K.P. Hole. The river is anywhere from 3-25 feet deep, so air lasts a long, long time. Underwater you can drift through sea grass, see little springs gurgling up through the sand, investigate small caverns, watch mullets and sunfish and small turtles. Gorgeous.
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