Hi Jim,
Sonesta Great Bay is sort of isolated. Certainly not walkable at night from anywhere and the walk to town in the sun is doable but why? If you can, try to switch to Sonesta Maho. Much more accessible area, lots of bars, restaurants, beaches etc. You wouldn't even need a car if you are only staying a week and don't want to drive around.
Good Luck
Cheers
irina
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The Friendly St.Martin Island Forum