Mata Chica definitely meets your specs.
While it is not "all inclusive" it has a good restaurant 3 meals a day, 7 days a week.
It's got a beach-side lounge w/pool table, a posh cyber cafe and lots of beach toys for guests. Full spa services on site.
You can walk next door to Rojo Lounge for drinks, bar snacks and wonderful dinners.
You can walk north to Portofino for more fine dining, or to Jambel for Jamaican fare ....... walk south to Sundiver for a wonderful funky beach bar with snacks and pool.
Well tended beach, loungers at the water's edge.