Hi Kim,
If you plan to stay just 3 days in PC, and dont want to leave the resort. your best choices are:
Barcelo Bavaro Beach resort. this is a huge resort with over 2,000 rooms divided in 5 hotels. the Palace a 5 star hotel and The garden, Beach, Golf and Casino 4 star. they have 14 restaurants, 15 bars, 3 discos, golf course, etc. the beach is spectacular in this area. as you see you wont need to leave the resort. in this resort you can eat lobster all day long.
Iberostar Hotels: this is one of my favorites, rooms, service, food, nightlife, everything is from good to excellent. Iberostar Bavaro is the best of the 3 Iberostar hotels.
Riu: 5 resorts in one. The Riu Palace and Bambu are the 5 star.
great atmosphere, one of the 3 best in PC in my opinion.
food and drinks are excellent. the beach in this area is one of the best. location: just next to iberostar.
Occidental Flamenco: the best choice for the money. great atmosphere, good food, and the best nightlife.
Catalonia is a nice resort, one of the most beautiful, the only problem is their location is far away from everything.
Paradisus is great too, but too expensive.
Melia Caribe & tropical is a good choice too. they have the best landscape in the area. a huge resort with excellent food at the la carte restaurants. ok at the buffet.
If you have any specific question let me know, maybe i can help you a little more.
good luck.