Choose the most economical way to travel from Shanghai to Dalian in summer vacation. Select transportation: _.

Most people want to arrive as soon as possible when traveling, so they take a long-distance plane or train and a short-distance bus. Sometimes, in order to enjoy the scenery on both sides of the river, there will be special tourist boats. The most economical way to travel from Shanghai to Dalian in summer vacation is by water, and the boat is the most suitable means of transportation.

So the answer is: the boat.