I did while I still had off-road tyres on, and did the outer perimeter track. Some of the inclines were a bit violent for me. I've switched to road tyres now, and I've been using a short circuit through Bushey Park, East Molesey, Walton-on-Thames - Hersham - (other side of) East Molesey - back through the park. I think its about 9 or 10 miles, not too much traffic (except going past Hampton Court, and over the bridge.