In Koh Phi Phi. For the final full-day itinerary in Thailand, soak up the picturesque views of Koh Phi Phi. Koh Phi Phi is actually a chain of three small islands, but only one of them, Phi Phi, Erawan Waterfall, is located nearby. Ayutthaya. The historic city of Ayutthaya is located a few kilometers north of Bangkok. Former capital of the Kingdom of Siam, and long important, Khao Sok National Park is one of the best-known natural places to visit in Thailand. One of the best places to visit in Thailand, Khao Sok National Park is located on the mainland in southern Thailand. It is a large tropical forest transformed into a national park. Khao Sok National Park is quite large and contains a vast territory. Contents. The best things to do in Thailand. 1 Scuba diving in the Andaman Sea and Gulf of Thailand. 2 Motorbike along the Mae Hong Son loop. 3 Have a drink at Sky Bar in Bangkok. 4 Island hopping tours in the South. 5 Admire the White Temple. 6 Hike to Phi Phi viewpoint. 7 Explore a night market.