DH and I went twice a couple of years ago. We stayed as guest of a friend in the Divi Beach Club condos. We had a 1 bedroom unit and just loved it. It wasn't all inclusive but was right across the road from the beach. An easy walk and the Divi has golf cart shuttles that run between their properties and to one of the casino's all of the time.
We also stayed at the Bucuti Beach Resort which is basically an adults only hotel. It's just down the road from the Divi and just behind the Alhambra Casino. Loved it! Was quiet and was right on the beach.
Both of these properties are on Eagle Beach in the "low rise" area. This area has lots of all inclusive properties and are right on the beach. There are several larger hotels farther down the beach but they are also very crowded. We drove around the island quite a bit, did an into to scuba class, walked the beach, went to the casino and shopped. We didn't take are kids so I can't help you there... Have a great time!
We booked the Bucuti almost a year in advance. If you haven't made reservations yet - you should do it soon.