There are two parking lots where you can park your bike for a small fee. If I remember correctly it should be 20 baht for a motorbike.
Coming from Kamala the first parking lot has a somewhat steep trail. Instead, drive to the second parking lot. Trail down here is not so steep, but longer.
Laem Singh Beach is one of the most beautiful beaches on Phuket Island, so long you don't mind sunbeds. There are also several restaurants under the trees along the beach.
Beach vendors are common at Laem Singh. A few minutes after you have settled down to relax, their radars will have detected you and will approach you with very nice goods. But don't expect to pay a reasonable price for anything they sell on the beach.
The beach is divided in two with lots of rocks in the water at the south end. The north end and most popular part of the beach has only a few rocks in the water.
Snorkeling is best at the south end, with okay snorkeling along the rocks.
Don't waist your time snorkeling at the north end. Walk south!!!
If you are bored with swimming or snorkeling, there is always the option of Jet Ski, Banana Boat or Water Ski.
Laem Singh Beach is a favorite beach for many people and the parking lot is always packed in high season.