What kind of sail boat? It seems like a wonderful plan... Hills are an issue in some coastal towns but usually it's nearly flat near the coast, so you might get away with a single-speed cog. In any case: use case... air tight to store the thing, to keep the salt air off of it..
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BMC Race Machine / BMC Team Machine / Rossin Record / 80's Pinarello Traviso / Merlin MTB / Raleigh "Folding 20" / Ti-Swift (!)
Erikson w/C&C couplers / Trek's: 2300, 1200, 990 / Jamis 'Sputnik' / Santana Tandem: Full Campy!