Day Trip from Bath to Chepstow Castle (no car)

Did you have another thread about Chepstow? I feel that there was one recently, but I didn't read it to know what was already covered.

Train connections from Bath to Chepstow that only require one connection depart around 8:30, 9:00, or 10:30 a.m. and take either 1h 40m or 2h 20m. Additional departures with two connections don't take any longer. I did not find any bus with a better schedule. See nationalrail.co.uk for ticket prices, including advance-purchase and roundtrip (return) discounts.

I would not go to Chepstow but opt for Cardiff instead as it is just over 1 hour by train from Bath. If you want to see a medieval castle - buy a return train ticket from Bath to Caerphilly (change at Cardiff). Going to Caerphilly would take the same time as going to Chepstow but you have the advantage of being able to have a look around Cardiff on the return leg before proceeding back to Bath. (The through ticket won’t open the barrier gate - see rail staff & say you are breaking the journey).
http://www.castlewales.com/caerphil.html
https://www.cardiffcastle.com..
OR you might choose to go straight from Cardiff Central station to Westgate Street (6 minute walk) and catch Bus 32A (every 30 minutes) to St.Fagans Castle & Museum - on the western edge of Cardiff. (This place is vast and takes several hours to see properly):> https://museum.wales/stfagans/castle-and-gardens/
https://www.visitwales.com/destinations/south-wales/cardiff

Thank you for the info. I did find the link to the train schedule in another post (not mine). I posted this to see if there were also any recommendations for hired taxis or tours that might work out. My reason for wanting to visit Chepstow Castle specifically is that I am a fan of William Marshal and want to make a pilgrimage of sorts to Chepstow to honor him. This year is the 800th anniversary of his death. I am also posting a similar request for suggestions on a couple of facebook history groups I belong to, hoping that a fellow history nerd local to the area would have some guidance for me. Again, thank you for the info! - Jill

It is relatively easy to go by train from Bath to Chepstow but you will need to change at Severn Tunnel Junction. (You will need platform 2 for Chepstow & P4 when returning to Bath). So, when the train goes through the long tunnel under the estuary, be ready to get off at the first stop on the Welsh side. www.nationalrail.co.uk will give you details of the services. On Sunday 25th August as lines are shut for engineering work.
http://www.castlewales.com/marshall.html

I would also recommend that you take a bus up the Wye Valley to see the ruins of TINTERN ABBEY. You should be able to find the buses on the following side. NOTE that at present, the road to Tintern is closed for a few weeks due to subsidence.http://www.traveline.cymru

Thank you so much James!

As James stated, the road to Tintern is closed at St. Arvans. To get to Tintern, follow the signs to Devauden, then the B4293 to Trelleck (not Trelleck Grange). In Trelleck, follow the sign to Tintern and the diversion signs. They will lead you to Tintern along an, at times, narrow road. When you enter Tintern (by the Wye Valley restaurant and hotel), turn right, and the Abbey is about a mile down the road. The diversion adds about 5 miles to the trip. As a side note, just before entering Trelleck are the three, 3500 years old Harold’s standing stones. They are worth a very shot stop if you can find a parking place. I parked by a farm access road. Caerphilly and Coch castles just north of Cardiff are both worth visiting if you had the time, but Caerphilly is the largest castle in Wales.