bit closer to home would be st georges lake in st goerges park , free parking & close to lake or eastville park , best lake entrance is from under m32 by hungary horse ph , you have to walk down a tarmac lane to the lake it follows the river frome to the lake , there used to be a good sized group a few years ago ! i know before you have mentioned sailing at vikki park in bath , there used to be a sailing club that operated at the bath spa university college , where the globe ph is take the A39 (corston ) theres a driveway on left set back from main road turn in and follow to top , sailing club use the lake in the grounds ! ( postcode is BA 2 )