The north - temples, waterfalls, trekking in the jungle, mountains, elephant rides, rafting down rivers, sleeping in hilltribe villages

Central plains & Bangkok - temples, ruined old capital city of Ayuthaya, Bridge over the River Kwai at Kanchanaburi, shopping, temples, river trips, markets, the Patpong red light district

The north-east ("Isaan") - sticky rice, strangest food you ever saw, wierd temples near Nong Khai, trips on the river, temples

Islands in the Gulf - coconut trees, beach bungalows, hippies, full-moon parties, seafood, whining noises, e.g., "Oooh, it's not as good as it used to be..."