I would recommend the CBR. I stayed there with my sister, brother-in-law, and their 4 year old son. He loved playing on the beaches and playgrounds. It gave him a time to play and us a time to recooperate from the long day. The bus stops are not far from the hotel room, however, there are only stairs, so I would ask for ground floor if you prefer. As for munchies, they had kid's meals in the food court and there is also a small game room. If you are not looking to walk a long ways to the main hub of the resort, stay at Martinique. If you want peace and an "away from it all" sort of feeling, stay in Aruba. CBR was great with accomodating us with a 4 year old. They even supplied a safety rail for him. Haven't really stayed at any other resort with a child. Really depends on how much you are willing to spend and your preference in transportation (bus vs. monorail).
Have a Memorable Vacation!