Slot machines are a piece of cake, but the
odds are the worst. Blackjack, if you're willing to put in a little work and learn basic strategy, has some of the best odds. Three-card poker is also a good option, and requires less effort. Basically, you just bet on any hand from Q-6-4 and up, and fold everything else. Finally, betting on red/black in roulette is very easy and the odds are decent, as long as you avoid the 000 tables.