Every summer we go to Fun Valley Family RV Resort for 2 1/2 - 3 weeks. But it is more south central CO just west of South Fork toward Wolf Creek Pass, a few miles from the continental divide. It is in the mountains.
An older very large and busy RV park along the South Fork of the Rio Grande. A lot of people spend the season (late May to mid Sept) year after year. A lot of them do things together. But I don't know that they organize group outings. The park does have regular golf outings, horse back riding, stocked trout ponds, miniature golf, tubing in the river, C&W dancing 3 nts/wk, other entertainment, restaurant, groceries, large laundry, etc. Easy day trips to Pagosa Springs, Creede, Great Sand Dunes, Cumbres & Toltec steam railroad, etc.
A place that many people love, and some don't, as you can tell by reading rvparkreviews.com.