I live in North Wales and with my work travelled to every single corner of the place, ITS BEAUTIFUL and appreciate why lonely planet called it one of the best regions in the world (
https://www.google.co.uk/amp/s/amp....planet-2017-lonely-planet-best-in-travel-list)
However, Places like aberscoh, pwllheli, porthmadog etc are lovely BUT ABSOLUTELY packed this time of the year so get there early to get a parking space and enjoy it before every cafe and attraction gets crammed. There are some glorius hidden places in North Wales and lots of 'secret' beaches, an OS map will show you all the the hidden beaches and attractions, and most importantly over Google maps, how to get to them ;-)
If you like the hustle and bustle of lovely but packed places, then, pwllheli, portmadog, llandudno, felinheli, bala, beaumaris, Conwy, Betws y coed to name but a few. North wales is absolutely crammed with lovely campsites, tooo many to list! The most famous campsite in North/ mid wales is Shell island!!!!! Right on the beach and absolutely MASSIVE, 300 acres!!
http://www.shellisland.co.uk/index.html
There are so many places to see and do so the first thing i would recommend is get to a tourist information office, you will be literally spoilt for choice what to do here all depending on your tastes.
If you like gardens, then Bondant gardens in Conwy (national trust) is just out of this world!!!!!
However, 2 x drives you HAVE to do in you Cali as they are spectaular are 1.) the A5 road from Betws Y Coed through Snowdonia mountain range, turn left at Capel Curig on the A4086 and then join A498 and; 2.) Horsehshoe pass. Seen them a million times, and still takes my breath away!
Welcome to North Wales, have a lovely and beautiful time!