I have always always wanted to ride along from Sandbanks right through Bournemouth and round to Hengistbury Head, jumping the groynes en-route. Can't see if ever happeneing but it would be LOADS of fun!
Have made enquiries about Avon Beach at Highcliff but didnt get very far.
Did you park at Mudeford/Avon beach? Think this could be feasible in the winter? I dont really know the area very well - I can find the quay and Highcliffe castle but not even sure I know how to get into Avon beach car park!!! (can always find it on the sat nav) Where would be the best place to park? I really want to go now!