Take advantage of sign up bonuses and rewards programs.

Do what you can to increase payouts.

Divide your bankroll into playing sessions. Set a loss limit, and don't go over it.

Set a win limit, and quit while you are ahead.

As always, do not gamble with money that you can't afford to lose.

Higher denomination machines often have better payout percentages. (This is because the casino is actually making more money, though a lesser percentage.)