I’ve wondered the same too. I’ve seen B&B’s state if they are Welsh speakers but not sure if campsites do the same cos that would be handy to know as then you at least know that you could speak Welsh to the site owners. I’m guessing to speak Welsh in the community you keep away from the tourist spots. Have you ever been to Nant Gwtheryn?
Dwyros Aberdaron comes highly recommended by the Jones family. Run by a local Welsh family sitting just above the village of Aberdaron and within walking distance. It has spectacular views and good, cleam amenities.
We drove up to Betws y Coed in our campervan for a few days and we visited Llanwrwst where we had some success trying to use our Welsh but when we dropped down to Aberaeron for a couple of nights we struck gold with the staff and fellow camppers on the campsite speaking Welsh as theiir first language ,and when said we are learners to our neighbouring campers they were Great going out of their way to chat.
We have spoken with more people here in Aberaeron in Welsh than anywhere before and what a great place it is to come and enjoy the language.