What are good fundraising ideas?

Write to some big companies and ask if they would like to donate a prize in return for advertisement of their products, then you can raffle the prizes off, but check the legal requirments as this would be considered a gambling enterprise so you might have to call it a guessing competition. Also nothing beats selling chocolates as this is something that almost everyone will buy, ask a well known chocolate company to donate or sell you chocolate at cost price so you can make a profit on sales