Ok I'll do my best with your questions...
Alcohol is reasonable and comparable to bar prices. 8 Bucks for a mixed drink as I remember. Premium drinks can be more. I'm not a beer guy so I cant say how much they run.
Arcade games are applied or paid for with your sail and sign card. You use your sail and sign to purchase a game card that tracks how much credit you have.
My daughter and I spend about 10-20 dollars a sea day in the arcade each.
If you like to treat yourself to Spa Treatments etc.. these can be pricy but my wife really enjoys her massage. I want to say it was 300.
The Palo, you should try it, was I think 30 bucks each extra, adults only.
Have a great cruise!