Without being too extravagant you can get by with 5000 to 10000 yen per day on lunch and dinner including transportation/subway/rail. That's about $50.00 to $100.00 in American dollars (minimizing taxi usage). Try to avoid the taxi's because that could cost a small fortune, especially in rush hour.
The popular referendum is a device which allows voters to approve or repeal an act of the Legislature. If the Legislature passes a law that voters do not approve of, they may gather signatures to demand a popular vote on the law.
During the time between passage and the popular vote, the law may not take effect. If voters approve of the law, it takes effect as scheduled. If voters reject the law, it is voided and does not take effect. 24 states have the popular referendum. Most of them are also initiative states. A third form of referendum, the advisory referendum, is rarely used. In this form of the process, the Legislature, and in some states the governor, may place a question on the ballot to gauge voter opinion. The results of the election on this question are not binding.