10 Places to Visit in Thailand as a Backpacker Bangkok. As Thailand's capital and its largest city it's very easy to get to and travel from. Chiang Mai. Being about 40 times smaller than Bangkok, Chiang Mai is the 2nd largest city in Thailand– crazy to think about! Chiang Rai. Pai. Khao Yai National Park. Koh Sok National Park. Koh Tao. Koh Phi Phi.