I was in the general Riva area, did some spins out of both sides, up to Lago di Ledro and descended on that side, descended into Arco from the other side. Mostly did trails around the Santa Barbara side. I did not find most of the trails and descents very interesting. A lot of it was very hidden, walkers trails really and you would not meet any other mountain bikers. Riva is very bike friendly and lots of cyclists but go a little off into the mountains and you meet nobody. That was my experience.