If you come to Indonesia and wanna feel using becak as an accomodation, you have to know what price you have to pay. Usualy, becak transport cost about $1-$1.5/kilometer. It depend on the track. Since powered by muscle, flat track and incline track result on different amount of food the becak's driver consume. The driver also consider your weight. Kid pay less, sumo's probably pay double or forbiden.
Don't forget about muscle engine, since they are all men, sexy - pretty girl pay less also, or probably free (if i was the driver, for instance ^_^).