Before visiting Koh Tan, it's important to know that the island is not developed for tourism, so facilities like restaurants and shops are limited. Bring your own water, snacks, and any other necessities. The waters around Koh Tan can be quite shallow and perfect for snorkeling, so don’t forget your gear. The island is mostly natural, so expect uneven paths and a bit of exploration if you're walking around. Make sure to respect the natural environment by not disturbing wildlife or coral reefs, as the island is a protected area.

To reach Koh Tan from Koh Samui, you can take a boat from either Bang Kao Beach or Laem Sor Beach. Local long-tail boats frequently depart to the island throughout the day, and private boat rentals are also available. Some tour operators offer snorkeling trips and excursions to Koh Tan, which typically include round-trip boat transport and guided activities. Make sure to confirm departure times with your boat operator or tour company in advance. The boat ride takes about 10-15 minutes, and once on the island, you can explore at your own pace.

The best time to visit Koh Tan is during the dry season from December to April, when the weather is sunny, and the seas are calm. This time of year is perfect for snorkeling and swimming in the clear waters. The rainy season (from May to October) can bring heavy rains, which may make the boat ride less comfortable and reduce visibility for water activities. To avoid crowds, visit early in the day or during the weekday, as weekends tend to attract more local visitors. Early mornings also offer a peaceful, serene atmosphere perfect for enjoying the island's beauty.

A visit to Koh Tan is an excellent choice for a half-day trip or a relaxing snorkeling excursion. Many day tours from Koh Samui include Koh Tan as a stop, often alongside neighboring islands like Koh Mudsum. After enjoying snorkeling and swimming, you can unwind on the island’s small beaches or take a leisurely walk through the lush, unspoiled landscape. For those who love the sea, there are additional opportunities for kayaking or paddleboarding. Combining a visit to Koh Tan with a trip to Ang Thong National Marine Park or Koh Tan’s neighboring islands will provide a full day of exploration and adventure.