Swansea all the way.
I went there for the surfing initially but after a few years away have moved back for the buggy beaches.
Another plus point is if you chose the right course realy low grades required (2 e's to get onto the course I did).
Flying sites near swansea
Swansea beach (outside the uni, be carefull in the summer though)
Llangenith (not the best bit lumpy but fairly large) and great surfing
Pembray (one word .............stunning)
Pendine (not quite as good as pembray, could be worth it on a S wind when the ban is lifted)
Can't think of any other uni with as many quality sites as near