St. Johns River, Florida
The St. Johns River may feel slightly off the grid—especially to northerners—but the tidal waterway in northern Florida has a lot to offer boaters. Real-deal honky-tonk bars and restaurants line the river’s banks, and if you push far enough upriver (about 100 miles) you’ll come to the Blue Spring, where crystal-clear water bubbles up from depths exceeding 100 feet. The scuba diving there can be spectacular, though entrance to the water is restricted during the winter months, when hundreds of manatees pack the spring to wait out the winter chill. Sightseeing is allowed during this time though, and those sea cows, they are really something to see.