Hi Larry, looks like you catch the 102 bus on the Rickenbacker Causeway to the Brickel Metro Rail. Get on the north bound orange line to the airport. Walk east on NW 21st Street to Hopkins-Carter at 3300 NW 21st Street.
If you have a dinghy, you can come by water. Head up the Miami River. After you pass under the 27th Avenue Bridge, take the first left into the Tamiami Canal. You'll pass under a small swing bridge. The store is on the right. There is a floating dinghy dock, just past a boat named Possum. Tie up and come on in.