Have tix for Chessington tomorrow but the forecast says windy and rainy in the morning and afternoon, probably OK around mid-day. Never been before and wondering whether we should change to a different day (tix are actually a non date-specific voucher but have to be used before 31 Oct. Can't really figure out from the map how many things are covered or how much time we might spend standing in outdoor lines? Can anyone help? DS's are 4 and 7 if that makes a difference. Don't mind getting a bit wet and have waterproofs but don't want to spend the day sodden.