Koh Nangyuan is a small island about 1 and a half hour from Koh Samui. It has great snorkeling and diving. It's lovely and there is only a resort there. You can get there taking a catamaran sped ferry which runs twice daily for 550 baht.
Another way of going there is to join a tour. There are several tours available in Samui to Koh Nanguyan, that have lunch and snorkeling gear included. It costs around 1.400 baht. Lomprayah is one of the tour operators.
In Bophut Village, you can rent an old fishing boat to take you out fishing in the Gulf of Thailand and then you travel to a deserted island called Koh Som where with your fishing boat captains you grill the fish up that you caught and have a Thai lunch. Sounds like a lot of fun right? Not really. The truth of the matter is that you go on this old raggedy boat which is actually kind of cool but if you get sea sick you definitely will on this boat. You spend about 2 hours out in the hot sun and you catch really nothing. Only the fishing boat captain catches anything and what he does catch it is the size of your palm. What is cool though is when you get to the actual island of Koh Som. Koh Som is deserted now but it used to have a bar on the island which you still can see the remnants of and plans were to make it an island for tourism as well, but it was too close to nearby beaches and the noise was too loud that already established expensive resorts on the other islands complained and Koh Som was left deserted. Your fishing boat captain will take you all around the island and you will actually take a sea kayak to another side of the island to explore where there used to be a bridge and where plumbing was set up for bungelows and you will actually see some deserted bungelows. You will be trekking over alot of deserted area with thorn bushes and hard gravel and a lot of washed up glass and junk on the island so make sure you wear some good water sandals to protect your feet. You will need to swim part of the way and if you aren't a good swimmer I wouldn't advise doing this part of the adventure because you have to swim in some choppy water where there are some high rocks that can really bash your knees and you have to make sure to keep your feet up so as not to damage any coral. Definitely have your tetanus shot if you plan on exploring the beach.
While on Koh Samui everybody should try and spend some time on the beaches. I was on Chaweng beach and spent a little time near Lamai beach. Both of these are full of tourists, but this is to be expected as they are beautiful, and offer many activities. The white sand, pounding waves, and anything you want or need, all within a short walk, make this a great way to enjoy the day.
My brother and I didn't miss a day of swimming in our entire stay, and there is nothing better to shake the cobwebs(hangover), than a dip in the sea first thing in the morning. After a few too many buckets you will understand what I mean. The good part about this was that it was only a short stumble down the path from my hut to the beach.
The beaches along Koh Samui can offer so many various, and amazing views. After exploring the island by scooter all day, we stopped for a little break and I was able to snap a few pics. This area near Lamai was a little rocky for swimming, but beautiful to look at for sure.
I spent many days again on this trip swimming or having a few drinks near the beach or my hut. It was a great way to meet new people and soak up some sun.
This time the beach was very calm and peaceful. The weather held out nicely and it usually only rained in the late afternoon or evening. It really didn't rain in Samui very much, and for this I was quite happy and surprised (it was September).
There was new areas to get a Thai massage, and rent jet skis. These are both new addition to this beach since I was here 7 months ago.
Chaweng Beach is the center of all tourist oriented nightlife on Koh Samui. The pubs and open-bars are the most popular nighttime destinations. There are f.ex. discos called Green Mango and Santa Fe. Usually the fun starts from 10 pm and lasts until the wee hours of the morning.
If you want to play pool, you should head to the bar called Luke's Black Jack pub. The main activities are centered on the back road where there are plenty of shops and restaurants.
from chaweng beach you drive south and pass lamai beach to Natien Beach. Here you have some nice resorts like Central Samui Village (nice restaurant they have called Reef Cafe) you pass this resort and the Butterfly garden. After this you take the first sand-road left. Quit have down. Here you find the empty beach - walk to the right and pass the corner - and fall in love.
Lamai Beach is Samui's second most popular beach. It's a little quieter and a little cheaper that Chaweng. Lamai has a broad selection of bungalow type accomodation, ranging from the budget end of the scale to the magnificent. Lamai is favoured by budget travellers.