Does anyone know of good, dog-friendly TENT camping near Denver, CO?

I need a place where we can camp with 8–10 people and 3 dogs. We’d like to feel a little bit secluded, and be able to let the dogs run around a little(I really just don’t want to be able to throw a rock and hit the next campsite), but maybe still have restrooms somewhere? I can settle for just one of these two opposing requests. I’d also like scenic hiking trails and maybe some mountain biking, a body of water would be AWESOME. We’re not backpacking, so we do need to be able to drive up!