@nic off peak, innit. I have grand plans to use a few more of these:
https://tfw.wales/ways-to-travel/rail/ticket-types/rovers-and-rangers
@womump @nic The Cambrian Coast is a gorgeous route, though possibly not to be attempted during school holidays.
I don't know if the timings still work, but it used to be possible to get the train up as far as Porthmadog, have a quick drink in the pub on the station, and catch the train back down as it returned from Pwllheli. Useful towards the end of the day.