Location
MIA Customs in in front of the Signature ramp. Both are on the North side of the field.
All luggage must come of for screening. Passengers can leave from the Customs building to go meet their transportation. You will get towed back to Signature (pay) after clearing or start engines and taxi to Signature, less then 200 meters, but required to get of the Customs ramp.
If EAPIS is correct and no changes clearing goes very quickly. Have a printed copy of your EAPIS report with all Pax and Crew details with you, and you confirmation number.
Miami South Beach is a great place to stay. Hotel Mondrian is on the west side of the SB, and has great drinks, girls and sunsets. Ocean Blv is the usual madhouse, and on the weekends traffic does not move.