Key Biscayne has long been a mecca for South Florida cyclists. Bike enthusiasts clad in brightly colored spandex shorts and helmets have made the scenic trek over the Rickenbacker Causeway to Crandon Boulevard for years. A trip on the barrier island can take riders through ritzy residential neighborhoods with an occasional view of the bay. Cyclists who wish to avoid sharing the road with motorists can cruise under the sea grapes and Australian pines at Crandon Park (on the north end of the island) or Bill Baggs Cape Florida State Park (on the south end). And there's no reason to feel left out if you don't own a bike. Last year, Key Biscayne became the first American city to team up with the bicycle-sharing app LimeBike. Users can track bicycle locations and rent one for $1 for every 30 minutes.