Gold Sierra is on the Bron Y Wendon Holiday Park in Llanddulas. It's a static caravan, so it's like a big bungalow. You can see the sea from the front.
It's got two bedrooms and sleeps up to four, and there's a sofa bed in the living area as well. It's a 3 Star place, so it's comfortable and clean but don't expect anything fancy. The park itself is quiet and family-run.
You're right on the coast here. You can walk down to the shore. The main road runs past, so you do get some traffic noise. It's handy for driving everywhere though.
Colwyn Bay is about ten minutes in the car. They've got a watersports centre. Llandudno is maybe twenty minutes, that's the big Victorian promenade with the pier. Conwy is about the same, you've got the castle there. It's all very close.
Further along, Snowdonia is less than an hour's drive if you want mountains. The A55 gets you there pretty quickly.
On site there's a kids' play area. The park reception is there if you need anything. You can bring two dogs. Bedding and towels are included, and there's parking right outside.
Useful links for planning trips: National Trust Wales and Snowdonia National Park.