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.
In 1917, at the behest of President Wilson, the Senate adopted a procedure known as the cloture vote, which could end a filibuster. If a cloture vote is called for, a super-majority of senators can force an end to debate and bring the question under consideration to an up-or-down vote.