I do not know if I would recommend it so warmly if it was alone but by adding the visit o Wat Na Khu Ha, a little further, I think it's an interesting way out for a 2 to 3 hours tour from Phrae city. There is also not far a waterfall that I did not go went see yet but can complete this little trip.
Golden Rock Temple (Wat Phra That Din Kwaen) is a temple and when you visit a temple in Thailand there are some rules to know and follow :