Don't do it. Please.....
St. Maarten/St. Martin is definitely NOT an AI island. Half the pleasure of this island is the option of dining around all parts of the island. The restaurants are all incredible and limiting yourself to all inclusive makes the trip almost not worth doing. Note I said almost - because if that's the only way you might come then AI would be okay. But certainly not the choice of most who visit the island. And if you might come on an AI plan, I'm thinking RIU in the Anse Marcel area of the island would be the better option of the few AI resorts on the island because of some on-going problems with the Sonesta Maho Resort, which is the only other AI island resort I'm personally aware of or might consider.