Looking at OS 1:50,000 sheet 115 if you start from Rowen and do a 6 to 7 mile walk to Llanfairfechan (rail and bus to Conwy) , apart from Caer Bach 9 different prehistoric sites (Settlements, Standing Stones, Mounds or Cairns) are on that route.
Also on the North Wales walk from Penmaenmawr (buses and trains) - about 5 miles- there are 7 different sites- stone circles, cairns, tumuli and a settlement.
Also get off the frequent coastal bus at Abergwyngregyn and head up the valley road to Bont Newydd and Nant (both common Welsh place names) there are a whole cluster of various sites up there- which actually link in with the Rowen to Llanfairfechan route.
So that OS sheet is going to be a vital friend to you- https://osmaps.com/
For anyone with a car there is a huge amount of prehistoric sites in that area, but more than enough there to be going on with.