1) Get enough cash to have a good time, but not so much that you’ll get depressed looking at your bank account balance the next day. No going to the ATM for extra money while you’re out.
2) In fact, leave your debit card and/or credit card at home. The pain centers in your brain activate when you pay for something with cash, causing you to spend less of it.
3) And for god’s sake, if you choose to spend money on someone else’s drink make sure that person is a friend. No sense spending money on someone just because you’re in a drunken stupor. He doesn’t care about you.