As you are doing a road trip in Wales in August be prepared for lots of traffic and difficulty parking. Wales as a holiday resort is my favourite place in the UK but we always go when there are no school holidays. Like Cornwall everywhere you want to go to may only be a few miles away but these are Welsh miles, meaning the nearer you get to your destination the further away it is, due to the twisty, turny over the mountains roads. So do lots of planning. Not mentioned so far, Llangollen Canal trip, which sails over Pontcysyllte Aqueduct, a wonderful experience. Any rail trips, including up Snowdon have to be booked in advance.