Assuming Wales is open (please check as we are going our own way from England and being a lot more cautious, thankfully)...
Can recommend a visit to St David's (eat great gelato, fish and chips, see the Cathedral, and take the boat tour around Ramsey Island with Voyages of Discovery – great fun. Did the boat trip during a hot week spent at a cottage in Mathry in June 2017). The coastline to the south, around St Brides Bay, features long surfy Newgale beach, and to the south the pretty little three-pub village of Little Haven (our favourite). Oh and if you're moving about then drop into the clifftop Druidstone Hotel for a pint and meal with a fabulous view. There's a campsite or two within walking distance of here.(
http://www.druidstone.co.uk/) Another amazing beach is just north of St David's – Whitesands. A nearby campsite with its own small sandy beach is Pencarnan Farm.
https://pencarnanfarm.co.uk/
As for Rowls1958's comment about Gower – 100% agree. It's stunning. Although it can get very crowded on sunny days.
Hope you do get to go. We'll be down there too, probably, if campsites are safe enough.
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