The most beautiful places in Thailand for beaches is Phuket, Krabi, ko Samui, phi phi island and many more. in Krabi you can explore the 7 island tour just like poda island, tube island, chicken island etc. Phuket has the best city life and nature along with the tiger kingdom and dolphin show. Phuket city tour is much more interesting as you can see the modern city as well as old Phuket town, big buddha, pagoda. Pattaya Bangkok is more combination about beaches and city, nature, temples. Thai peoples are more friendly they can help if you need help. Bangkok is the place you can explore the famous wat chalong, river cruise like chow phraya and had flavored dinner in the cruise itself. It share the boarder of Cambodia and Laos. The sea of Thailand is adman sea and gulf of Thailand. Thailand is 1:30 ahead from India.