I lived on bay campus last year, you'll become great mates with your entire building, we had a facebook group chat for our building so we always had a few nights out/ parties together. The 8x is an express bus which goes directly between each campus and takes around 15 minutes. This year I am living in student housing in Brynmill but i study on bay and i get a half hour bus to campus each day but honestly I love it, you explore the city much more than if you are studying and living in the same place (I didn't leave bay campus often xD)