It is inevitable that there will be some days over the summer in Cornwall when it rains. Perhaps it will be a short, sharp shower where a quick duck under a doorway or umbrella is enough followed by warm sunshine straight afterwards. Or, it may be a prolonged afternoon of rain where it's best to plan indoor entertainment for the family. No need to stay cooped up in your holiday cottage in Cornwall when the heavens open, read on for some great ideas on what to visit that will keep you entertained and dry.