Trails around Boulder might be interesting, I'd volunteer to apply bug dope if I can pick and choose who I apply it too!
Now its a party!
I used to bow hunt a spot here in California where I had to drive along this little river for 8-10 miles. It had lots of good swimming holes and rocks for the girls to lay out on, every trip in there we'd see a few girls out swimming and laying on the rocks naked. Contrary to most nude beaches these were definetly girls you wanted to see naked.