The quieter of the two "big" beaches of Samui, the water was a bit murky during the rainy season as most of the island is. I would recommend staying and bathing far from the river near the north end.. although that is where the night market is located which is excellent for cheap delicious food. There are also nightly food stalls somewhere near the center of the action near the cluster of sexy bars... Pretty funny stuff those are. Families and backpackers alike hanging around this area, plenty of hotels and lots of sand.

I stayed twice at Lamai Beach in August, at the beginning of Aug, I stay for 1 night, it was a prestine white sandy beach with super clear and calm waters, it was a 5 stars beach. Then I returned for a week long stay at the end of August, the wild weather dramatically transformed the beach beyond recognition, muddy water, very strong waves, rip current with some stingers in the water and tons of seaweeds. So ended up couldn't enjoy it the second time. What a shame. So finger crossed, check the weather closely before booking. When you are there if Lamai is bad, check out Crystal Bay and Coral Bay close by.

A nice long beach, picturesque in areas. I took a long walk all the way along it and back to get a feel for what's on offer. Lots of beach front bars, restaurants and also hotel/bungalow type places if you need them. The sea isn't very clear but is warm. Toward the rock formations the sea becomes more rocky (obviously) so tread carefully as you get in.

There are nice trees for share and plenty of vendors nearby. Free Moto parking is abundant. The one downside is that often there are sand fleas and little itchy insects in the otherwise wonderful water.

A better beach on Samui, but unfortunately still just a beach on Samui. If you haven't planned your travel yet, pick a different island. I highly recommend the Andaman Sea over the Gulf of Thailand.