Lily Lake Campground is pretty sweet, in that it is very private and remote.
The cattle from nearby farms would come by and visit in the mornings and drink from the lake.
Our campsite was on the cliff overlooking the lake, just past the boat ramp.
Great place to stay that is close to Yellowstone, if you have a 4WD vehicle to get to the campsite. Follow signs to Lily Lake, b/c there are several lakes on the turnoff.