Snowdonia is located in North of Wales, it is a huge National Park. Most of the routes are scenic! I don't think it is possible to visit without a car! Everyone drives then start hiking at some point.
We left Snowdonia at sunset, and the roads were horrible. it was total darkness if our headlights are off. We saw bunnies, sheep crossing. Haven ever experienced something like that! Thank god that my friend is a really alert driver! Arrived in Cardiff after midnight, a short stay before heading to Bournemouth the next day!