Our family from the U.S. will be spending one night in Caerphilly and want to eat dinner at Mermaid Quay and walk around the bay the evening of May 10th. Is there cheaper parking close by than that found at Mermaid Quay (3 hours--4 pounds)? What are your recs for good but reasonably priced food (possibly Welsh)? About how long will it take to eat dinner and walk around the bay? Thanks for your help.