Hi. I am considering a 3-4 day trip to the area in late August or early September, likely flying into Manchester and taking a train down. I would like to walk up Snowdon (Pyg or Miners track) and see Caernarfon and at least one other castle. I'm not going to try driving on the left side of the road, so I am wondering where would be the most convenient town to stay in for bus and train transport. Betws Y Coed, Llanberis, Caernarfon, Conwy, and Llandudno all have their pros and cons. Somewhere else? Is the Sherpa bus reliable? I would be traveling alone and I'm very nervous about getting where I need to go. Any and all opinions on this would be helpful. Thanks.