It's a very nice resort, with a beautiful oceanfront location, just next door to the Westin. The Westin hotel offers on-site restaurants and a casino, I believe, though I've read that the casino is dead. Not sure if they share amenities. There is a long sandy beach, with lounge chairs that you can rent, but because it's on the East side of the island, it is the rougher (windier and rougher surf) side of the island, certainly too rough when we traveled there in Jan/Feb '14.
I'll also warn you that it's rather remote, so a rental car is a must. A few restaurants are located in the Oyster Bay Marina, but if you want to venture to Philipsburg or Simpson Bay, the hot spots of the island, it's going to take you awhile to drive there.
FYI, it's about 15-20 minutes to the Philipsburg/Salt Pond area (grocery stores/restaurants) and another 10-15 minutes to Simpson Bay, which is the "hot spot" of the island and very near the airport. The good thing is that it's centrally located, so not too far to the French beaches. Our personal favorite was Friar's Beach, about a 20 minute drive.
Dawn Beach Club is a timeshare (but not affiliated with the Starwood Vacation Network) and they market it aggressively (they have people stationed on the road, flagging people down under the guise of winning something), so be prepared for a hard timeshare push.