Emma,
I have lived in North Wales for 16 years.I live next to Portmeirion just outside Porthmadog.
I cannot think of a more beutiful place to live.
Within minutes of home there are good beaches,one you can take your car on,estuaries,rivers, mountains, steam railways,wonderful gardens etc.
However we do not have what i call a CITY way of life, nightclubs etc. exactly the reason i came to live here.
People who do not appreciate these things just drive round in cars, and except for the towns, never get out to walk and see what is on offer.
Llandudno is our main seaside resort, 45 miles away, so don't go too often, however it is in my opinion a good seaside resort without the rowdiness of others.
Which site? The Ffestiniog site,caravan club,is an excellent site.
An excellent private site is Bardy, between Porthmadog and Harlech, good views and spotless facilities.They don't accept dogs so you would be ok.
Hamer