You'd be in for a treat if the weather wasn't so shit.
Plymouth street is pretty rad.
Dartmoor: Burrator, Coombestone tor, Bonehill, Hound Tor plus many others. Burrator is about 20 mins out of plymouth towards Tavistock. You'll shit your pants. One of the UK's best natural spots that only about 6 different people have ever ridden.
Cornwall: Cligga head nr Perranporth, north coast. Lamorna Cove near Mousehole and Lands End, south coast. Those are my two favorite spots though there are 5797596 others.