There are some ways on hotwire to tell. Go to www.betterbidding.com and read the hotel descriptions. There is NO way to tell what you are getting on priceline.
However, Swan/Dolphin show up RARELY on either of these and even if your hotel description matches every category on Hotwire there is the off chance that Hotwire has changed something and you will wind up with someplace else.
I suggest you look at all the resort hotels that have been received on hotwire and/or priceline and make sure you can live with any of them before you go that route.