You'll have the best chance to cash out a winner by making lots of small bets at blackjack. This bonus at
Intercasino is actually one of the best ongoing monthly bonuses available. I play it pretty much every month.
I usually use the single deck blackjack game to do my wagering requirements, but that's much riskier because of the $25 minimum. If you don't mind the time to do the wagering in smaller increments, the regular blackjack is the way to go. If you play the multi-player game, they deal about 2 decks of 8 before shuffling. If you happen to be by yourself at the multi-player table, you can force a shuffle by leaving the table. However, at Intercasino, you'll rarely be alone at the table.
It's also worth noting that this is one of the places that carries forward wagering requirements. If you bust out before finishing the requirements for a bonus, you'll still need to finish them as well before cashing out a future bonus. No big deal, but worth knowing about. If you play small-bet blackjack, you shouldn't have that problem anyway.