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.
Article II, Section 9, of the California Constitution provides for the referendum process in California. Electors have the power to approve or reject statutes or parts of statutes, with the exception of urgency statutes, statutes calling elections, and statutes providing for tax levies or appropriations for usual, current state expenses.