Llangollen for access to Clwydian and Berwyn hills - and for being a nice place in itself. There are plenty of hotels, Bed and Breakfast homes, and a Youth Hostel as well. Beddgelert or Capel Curig are better bases for Snowdonia where there are lots of excellent high level walks (in British terms as Snowdon itself is 3560 feet). There are good routes in the Carneddau and the Glyders, and a real feat is to complete all the 13 3000' in one day - only really feasible in summer by a very fit person.

Is this the sort of thing you are interested in? or did you have more gentle activities in mind? "Hiking" appears to mean different things in various contexts, but if you are interested in exploring the hills and mountains of (North) Wales I'd be willing to assist - it is my favourite recreation - no, make that second favourite!