My take on Coed is that you can get the most out of it if you do one ride on the visitor centre and one ride on other side of the road (where the original centre was) as they are quite different. For your first trip I'd avoid the long, long ride (can't remember the name) as it is long but you'll not miss out on anything by just doing the shorter rides.
Enjoy the cake and food at the visitor centre as well as the showers with heated floors!