Parc Glynllifon is the former estate of Lord Newborough, south of Caernarfon. Its grounds are the reason to visit, with woodland paths, an arboretum, follies, and a modern amphitheatre set into the old estate landscape.
It is a gentle stop rather than a headline sight, but useful on a rainy or slow day around Caernarfon. The arboretum is the highlight, especially for travellers who like historic parks more than formal gardens.