Most of London's attractions are along the Thames River, so a boat tour of the Thames River is the best way to travel. There are many kinds of cruises on the Thames River. The most economical one is this kind of cruise. Flat cruise can be used as 80 tourists at a time. It has a very wide view on the boat. It feels very good and economical. It costs only 25 pounds. It is a very recommended way to visit the Thames River.