I forgot to add that I will be coming from the United States and have never been to the area. Thanks in advance.
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In a couple of weeks I will be flying into Gatwick, and plan to take a train up to Cardiff and then over to Tenby. What train service do I need to take from Cardiff to Tenby? Also is the train service such that I will be able to do exploration (shopping & sightseeing) in the general area? Any tips will be appreciated.