well, the  game that has best odds for the player is BJ, but since it counts only 2% toward the WR, its out of option. And coz slots counts 100%, i imagine you really dont have a choice but to play slots.
As of bonus hunting you have chosen not the best way to start.
I suggest you to look for the Best Blackjack bonuses.
If you arent familiar with BJ rules, you can find all the data here.(strategy charts, house advantage, etc)