The last time I was at St. Martin, I opted to go right over to the French side as soon as I got off the ship. Hopped a taxi for $5 pp along with about 5 other people.
We found the market down on the waterfront and it was wonderful. There was so much to choose from and the prices were way cheaper than the stores.
We ate at a little open air Brassiere across the street, they had wonderful quiche's for about $5. They were so big, nobody could eat the whole thing. We had fun wtching the cat chase the chickens through the restaurant. We even fed the chickens french fries.