I figured out a few years ago how far you could get on city/county buses in south Florida if you start on the first bus of the morning from Key West; you end up stuck overnight in downtown Fort Lauderdale, but can then go forward in the morning on the Broward and Palm Beach buses all the way to Jupiter (the town, not the planet). If you use the Tri-Rail trains (Miami to Jupiter), you can get there much quicker.
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