Swimming and snorkeling conditions vary by island and season. During the dry season (November to April), waters are generally calm and safe for both activities. The wet season (May to October) can bring rough seas and reduced visibility. Always check local conditions before entering the water, wear a life jacket if you're not a strong swimmer, and stay within designated areas. Marine life is abundant but generally harmless; however, watch for jellyfish during certain periods and avoid touching coral to protect both yourself and the reef ecosystem.

The optimal time to visit is during the dry season from November to April, when seas are calm, skies are clear, and rainfall is minimal. December to February offers the most pleasant temperatures and best weather conditions for island hopping and snorkeling. March and April are hotter but still good for water activities. The monsoon season from May to October brings rough seas, frequent rain, and reduced visibility for snorkeling, with some tour operators suspending services during these months.

Access to Ao Phang Nga National Park is primarily by boat tour from Khao Lak or nearby coastal areas. Most visitors book organized day trips or multi-island tours through local operators in Khao Lak, which include hotel pickup, boat transfers, and often lunch. Tours typically depart from various piers along the coast. You can also arrange private longtail boat charters for more flexibility. The park encompasses multiple islands, so tours vary in routes and destinations covered throughout the day.

Most islands within Ao Phang Nga National Park are uninhabited and have no permanent food or accommodation facilities. Visitors typically join day tours that include lunch, often served on the boat or at a designated island stop. For overnight stays in the area, base yourself in Khao Lak, which offers numerous hotels, resorts, and restaurants to suit various budgets. Some tour operators offer overnight boat trips with onboard sleeping arrangements, though these are less common for this particular park area.

The park is famous for its dramatic limestone karst formations rising from emerald waters, creating spectacular scenery unlike typical beach destinations. The area features numerous caves, hidden lagoons, and small islands perfect for kayaking and exploration. The diverse marine ecosystem makes it excellent for snorkeling, with opportunities to see colorful coral reefs and tropical fish. The relatively undeveloped nature of many islands provides a more pristine, natural experience compared to commercialized beach areas, offering peaceful spots for those seeking scenic beauty and adventure.