There’s nowt really on the doorstep – big road scene though.
It is actually possible to get a train to Antur Siniog with a few changes – you’d need to really want to go though, take hours.
Up the coast there’s an impressive stretch of beach / sand dunes / pine forest – worth an explore. Starts at Hall Rd train station and stretches up to Ainsdale. You can have some fine rides here but there’s almost zero rights of way, NT area and rangers who will tell you to do one. Proper sandy as well – fat bike land.
Either way, don’t show up with a valuable bike to university halls on day one – theft can be an issue. Massive buildings, friends of friends of friends passing though etc. Bring it up once you’ve got the lie of the land on keeping it somewhere safe.