If you clear into the U.S. In San Juan, the you do not clear again in Miami as you are completely cleared in.

For night life, take a look at south beach for dinner, perhaps at a nice outdoor place on Lincoln.

Warren S/V Scuba Doo
Lagoon 50 (winner of best crewed yacht under 55 feet at the St. Thomas crewed yacht boat show).

https://www.cyabrochure.com/ebn/2307/pdyrX/6642/4///