We had so much fun at Disney Quest that we're making a special trip back just to spend more time there. To answer some questions and add some advice:
1. Aside from money for food, coffee, and desserts, you don't "need" any extra money at DQ. All the good stuff is free, though you can buy a few things if you want.
2. Internet access in their cybercafe is free and excellent. You may get a message asking to "add credits" that is a leftover from the days when you had to swipe a card with credits on all the machines. Now you can simply push the button on the card slot and get (I believe) ten more minutes.
3. Pirates of the Caribbean is the one attraction not to be missed. It is so much fun and so high-tech as to be breathtaking. It is especially good for adults with no kids because the game is more fun with at least four people (the more gunners you have, the better you'll do!) so the CMs will offer to pair you with another childless couple in line. If this happens, say yes! It's a fun way to interact with strangers.
4. You can return with a hand stamp, so feel free to slip out to House of Blues for a few adult beverages before heading back for more arcade fun.
5. The "sports simulator" games are a hoot. Don't be embarassed to try boxing, deep sea fishing, "xtreme" street luge, soccer goal kicking, and so on.
6. The CMs are real geeks! If that was your crowd back in school, you'll fit right in at DQ. (None of the "I'm too cool for Disney" or "I'm bored out of my mind" attitudes you might find at the other parks.) Strike up some conversations, and they'll give you all kinds of hints, like how to squeeze 13 inversions into one ride on Cyberspace Mountain or how to find the secret treasure-filled beach on Pirates.
7. Be prepared to spend even more time there than you expect. We were there on two different days, 8 or more hours each time, and closing still came as a shock on both days.