I usually stay at the Blue Tang also. Just like the location to say the least. I use Island Adventures for my golf cart. They are located across the street from the airport so I just pick up my bag and walk across the street. Their prices are competitive with most on the island. You can email them for specials, ask for Lucy. I assume she is still there. She is very pleasant to deal with. I know my way around well so its so easy to just drive myself to and from the airport using my cart instead of waiting on taxis. As far as groceries, I usually just use the 2 shops located behind Blue Tang. They are close by and the Cayemart carries more selections from the U.S. for items I am sketchy about.
Enjoy your trip !