Steve makes good points.
All inclusives really haven't caught on in CR. Here's a partial list.
http://www.vacationscostarica.com/hotels/all-inclusive/ Also add RIU, near but not close to Coco, and Barcelo's Playa Tambor, both of these are kind of in the middle of nowhere; and like he said the Hilton Papagayo, not sure about this one other then $$$. All of course have websites. I stayed at Tambor 10-12 years ago. Very,very nice, good value, but constant flat crummy surf, boring as hell, the howler monkeys started at 4-5am like clock work, and loaded with Euro's lined up for the food thing an hour before the bell. A recent poster said there was now more adventure stuff to do in the area.
I'm sure they can all line up activities for the K*ds but distance would be my issue. How far are they going to travel to get to the fun?
I'd favor a condo in ManAntonio also. No all inclusives but a world class beach, lots of adventure stuff to do close by, "healthy" environment, and last but not least, there's a regional hospital there right next to a regional airport, a too often under-looked feature when you're going to be doing the adventure stuff.