If your thinking in terms of Cancun, We just booked a vacation there. I did a lot of research. I like expedia. It sounds like you should stay away from the Oasis Cancun. It looks nice but the MANY reviews were horrible!
This is what we booked....
Air and all-inclusive 7 nights at GR Soloaris (for 4 people!!) for $3644 in November.
All inclusive at this hotel includes All meals, unlimited selected drinks (including alcohol) All non-motorized watersports (snorkeling, kayaks, small boats, 4 pools (1 with swim up bar) 3 bars, live entertainment, beach volleyball, ect...
There is also a bus that will take you down the strip to differant bars, shops, resturants, anywhere you want to go for a small fee.(cheapier than a taxi) Got to check out Senior Frogs.
Also a place that you can swim with dolphins for around $100 but Im not sure yet how much it would cost for transportation to get there and back. Parasailing is popular and it is offered many places around all the resorts.