Thanks for the suggestions.
I spoke to GrantAir at Marathon and spoke to Island City Flying service, the FBO at Key West.
GrantAir have three new C172s, which go for $95/hour wet plus $40/hour for the CFI. Sadly they no longer have the floatplane shown on their website.
Island City charge $89/hour wet for their C172s plus instructor fees.
Since I'll be closer to Marathon than Key West, I'll probably organise something with GrantAir.
Report when I return!
[This message has been edited by BayAreaLondoner (edited 14 May 2001).]