We have stayed 3 times at Durango Riverside Resort! We love Durango, and have been there many times (before and after getting an RV). We haven't seen a better RV park in the area. We love it there. Good folks, good park. Park is gravel, and sloped toward the river, so bring leveling blocks if you need them. Watch for deer on the other side of the river in the evening. We've gone (mild) river rafting on the Animas River, and rented a 4x4 Jeep to go up and over the Alpine loop, over Cinnamon Pass and Engineer Pass, near Silverton and Lake City. Riding the steam train to Silverton is really neat, I recommend the bus trip return. (a really long day if you ride the train back.) The Durango Mtn. ski resort is open during the summer and has a fun Alpine Slide, as well as mountain bike rentals.
BTW, Jeeping over these passes is not "tear 'em up, racing, off-roading" like you might think. It's crawling along a narrow, barely improved rocky, bumpy path at about 10 mph, and seeing amazing scenery, foliage, snow, waterfalls, rivers and and wildlife... with very little sign of man. If you happen to meet oncoming jeeps or 4-wheelers, you find a way to pass carefully, and rarely are you passed from the same direction. We traveled right at 69 miles in 8 hours, in one day. It was truly awe-inspiring! Here is a link to our blog about this:
http://mammothtravels.blogspot.com/2011/06/jeeping-no-mammoth-allowed.html