Google for some of the Dragon Ride routes – there will be GPX of them available – I did the 2011 one it went past Afan/Glyncorrwg.
Classic South Wales Road climbs are the Bwlch and the Rhigos (just by the top of the Skyline) – the top loop from the 2011 Dragon (route below) will take you over both.
Routes Archive: Dragon Ride 2011 (Gran Fondo Route)
Getting out of swansea towards Neath strikes me as a awkward though – there’s some sort of shit cyclepath alongside the Amazon warehouse (presumably Route 4 of the laughably titled National Cycle Network), but I don’t know a good route – someone else may be able to help.
Gower roads have the potential to be shocking on a nice day in the school holidays