The check-in point in Thailand is at Chiang Saen. It is a courtyard to receive the wind along the Mekong river, which is very comfortable for the eyes. The cool breeze blows to the shore and sits at the bar table where you can choose to sit and take pictures. This is also the point where you can take a ferry to Laos. It is a very charming street with restaurants, massage parlors, complete with food items, not crowded.