How funny, we did the exact same thing last year my folks live that way. Highly recommend Cheddar woods, we went with hoseasons and stayed in very basic chalet but was lovely and the pool was great. Little playground and tiny indoor play area, as well as mini bowling and loads of outdoor activities. Ours were too young for the organised stuff though. About 45 minutes to Bristol and also plenty to see around Cheddar too. Puxton park was great fun.