What to See:

 The reason why people come to Samui is, quite simply, the beaches which remain stunning after decades of development, helped in no small part by a height restriction on new buildings.

 There isn't all that much to see on the island.   Bang Rak has a large but nondescript Buddha statue, and there are some waterfalls (notably Na Muang) of minor interest.

Activities on Koh Samui:

The usual panoply of watersports are available, including plenty of dive shops, but most diving is done either in the nearby Angthong Marine National Park or Ko Tao as the visibility around Samui's sandy beaches tends to be poor. You can book diving day trips at dive shops, most of which are based in Chaweng. The dive boats tend to leave from the pier at Bophut.

Sailing is beginning to become more popular in Samui being led by the success of the Koh Samui Regatta and the continued popularity of the day cruises and sunset cruises aboard the 52 foot sailing catamaran Kia Ora. The major hindrance to sailing in Koh Samui is the lack of a marina to provide safe mooring, the support infrastructure and services. There have been many rumours about marina construction being imminent but nothing has yet been done. So when you get to Samui, expect to find it hard to locate a suitable provider and also expect to either clamber over rickety wooden jetties or be ferried out on the tender dinghy – all adding to the wonderful Thai style sailing adventure.

 Santiburi Samui Country Club boasts the only 18 hole golf course on the island. Located inland from Mae Nam, the neighbouring town to Bophut, the challenging mountain-side and high valley fairways offer stunning views of the bay area and distant Ko Pha Ngan. Golf carts are compulsory, to prevent the exhaustion of players otherwise following the steeply rising and falling fairways. Large greens offer some compensation to players distracted by the fabulous views and lush tropical setting. The clubhouse includes locker rooms, dining, conferencing rooms as well as a driving range, practice green and shop.

Kayaking is a great way to see the Angthong Marine National Park. Look for a credible tour operator when on the island.

 There is a nice natural pool at the top of the Na Muang waterfall 2. It's about 30 minutes steep hike from the point where the road ends. There are also some elephant ride businesses, that can take you to the bottom of the waterfall.

Shooting -  you can visit the Samui shooting range and fire various 9mm and revolver pistols and even the famous AK-47. Turn up and shoot - prices are quite steep around 1000 baht for a magazine of ammo but it does make for a memorable experience and is suitable for small groups. 

Samui's Bungy Jump situated on the Reggae Street side of Chaweng Lake.

There is a "Tiger Zoo" and Tropical Bird Show - south of Hua Thanon