First thing to do is to do a SEARCH on this site and on
www.debbiesdominicantravels.com for the RIU hotels.
Next you do a search for "POP-things to do"
Next, you look up DAMAJAGUA FALLS
Next, you look up posts by "SLIVER GHOST" and then posts by Silver Ghost.
Pointers: RIU is about 10 or 12 klicks west of POP on the highway to Navarrete and Santiago. It is like that for a reason.
The above poster gave you a good hint. Get out of there and look around.
Go to Ocean World, a must.
Keep asking after you look around the site for a bit.
Have a good day
HB