Hi, hopefully you will have some sunshine and will be able to just relax on beach! The main beach is very accessible as is the harbour beach just behind the harbour. At low tide you can walk to monkstone which is a beautiful beach. You can also walk to Wiseman's Bridge through the tunnels (fine for pushchairs) where there is a pub right on the beach, about a mile each way. Tenby is good for mooching and Narberth is particularly good for shops, vintage and eating out. In Saundersfoot the Kookaba is popular for steaks, Mermaid for Fish & Chips, Swallow Tree for seaviews and good, reasonable food. They also have a nice, warm indoor pool there which can be used by the public if not too busy. If you like walking then Barafundle beach is worth a visit, about a mile over the headland and Bosherston Lily Ponds through to Broad Haven is a lovely walk too. There are plenty of attractions nearby such as Folly Farm, Manor House if DS is ready to enjoy these. Hope you have a good trip!