Nai Yang is one of those 'out of sight' beaches popular with returning travelers... Nice, shaded and full of tiny fun bars and restaurants, it remains relatively unknown, like most of the northern beaches of Phuket which are not along the main road. Only Indigo Pearl Hotel at this time is really next to the beach. Dewa Hotel is not far but you would have to walk a bit to reach the beach.
The beach is large and sandy but water might not always be as blue as on other beaches. People often prefer to hang in the shade enjoying a breezy peace.
Because Nai Yang Beach is just next to the Sirinath National Park, locals love to spend the week end picnicking and drinking under the trees while the kids play in the sea. A good opportunity to try all kinds of real local food sold on carts, it usually tastes better than in restaurants! (try Som Tam [papaya salad] with Fried chicken and get back to me about it!)
Few shops on the beach sell batik clothing and beach toys, and across the tiny street, you'll find the unavoidable tailor, a mini mart and even a diving shop. Like on any beach of Phuket, a little group of elder ladies stands by chit-chatting all day, waiting for the opportunity to give you a nice beach massage.
Like many northern beaches, low season is pretty quiet, but some places remain open all year round and it's a popular Kite Surfing spot, so even though swimming is not safe you can see and get some good action in low season.