http://r24.org/phuket-info.com/samui/lamaiinn/
try this hotel but ask for new poolside room good spot
I stayed at the Lamai Inn 99 right on the beach great spot except for 200m walk at night down an unlit lane only time I have not felt safe at night in Thailand just needs a few floodlights and would be o/k.
Forgot to pick me up from airport,and room was 2 single beds and pretty basic at 1100baht per night.
Had a whinge about room and was offered a pool view room at 1200 baht (normally 1300 baht i thinks)this room was spot on king size bed,modern bathroom looked very new just next to good pool.
The Resturant at lamai inn was spot on good food ,great view ,right on the beach.
If I go to samui again would stay here but only in pool view room.
The beach is great deep water for swimming with shade trees available very clean sand and water.