I was actually close to booking the mariott stellaris casino but i know they have multiple mariott's. Is that the one you stayed at? If so is there much to do right around the hotel or is it further away?
Don't do the other one further south, it may seem like there's more activity, but its not the good beach location...forgot the name but your good where you're at. The resort/casino (where I stayed) was next to the time share places and that location was great. If I can remember correctly, it was like one of the furthest resorts to the north on the island and that's where you wanna be imo.