Weston is it within an hour for most Bristolians, Brean also works but normally people only go when the beach racing blocks weston although some prefer it to Weston in a southerly. Burnham is good in a north westerly but parking is limited and ou really need to go with some one who knows it first time. Cold knapp at barry is about an hour depending on exact start point - have a look at www.winsurfing.co.uk
for the south wales scene. Weymouth, Portland and poole are all over an hour and half again depending on starting area of Bristol.
Some Nomads share from time to time - I am no longer Bristol based.
Join and make some friends.