Thanks for all the suggestions and recommendations, both on the board and via PM. Sounds like this could be quite an exciting business trip!
I really hadn't thought/considered seaplanes - will seriously consider that. The general sightseeing trip down towards the Keys also sounds fabulous.
I'd already written off recording anything formal in the logbook (I won't be PIC or under a training course), and I'm not sure that a Seaplane rating would really be that much use where I normally fly, so will remain in blissful ignorance of what the procedures are for getting/converting/retaining an FAA PPL on this occasion.
....and as for Caipirinhas... sorry but they're just not the same outside Brazil.
SD
PS: For once, my board name is accurate! It is indeed Sunny today and I am going flying - yippee.
