Multi - there aren't any huge hill on Anglesey, except a steep climb up towards Holyhead. The only other significant bump is Parys mountain, which isn't a mountain at all; more a hill rising to 147m. But it's worth a visit to see the old mining works. A nice route might be up to Penmon from Beaumaris, stopping to see the old priory and look over to Puffin Island. Then on up to Moelfre, which has a cute little harbour. Then skirt round to Amlwch, up Parys Mountain, over to Llyn Alaw, cross the island near Llangefni then back on the side roads to Beaumaris. Not sure how far that is, but Ynys Mon is not huge!