Richelieu Rock is only accessible by boat, and diving here requires a certified diving license. Most trips are full-day excursions or part of liveaboard diving tours. The currents can be strong, so it is recommended for divers with some experience in open-water conditions. Visibility varies depending on the season, but the best conditions are usually found between February and May. Snorkeling is possible, but due to the depth and currents, it is not as common as diving.

The only way to reach Richelieu Rock is by boat. Most diving trips depart from Khao Lak or Phuket, with speedboats and liveaboard tours operating regularly during the diving season. The boat ride takes approximately 1.5 to 2 hours from Khao Lak. Booking a tour through a certified dive center is the best way to ensure a safe and enjoyable experience.

The best time to visit Richelieu Rock is between November and May, when the sea is calm, and diving conditions are at their best. The peak season for whale shark sightings is from February to May. The site is closed from May to October due to monsoon conditions and to allow marine life to recover. Morning dives usually offer the best visibility and the highest chance of encountering large marine species.

Since Richelieu Rock is a diving-only destination, most trips focus on underwater exploration. However, some liveaboard tours combine Richelieu Rock with other dive sites in the Surin and Similan Islands, providing a multi-day adventure. For non-divers, exploring the nearby Surin Islands by boat offers a chance to enjoy pristine beaches, snorkeling spots, and lush tropical scenery.