What is included in a 2 day pass? What's the difference between aquatica and adventure island?

This depends on your retailer. Compare prices online to your retailer (may be higher). Tickets may include 1 adult all day eating pass per day.

Same set up. Not a lot of difference in attraction rides. Adventure island looks better to the eye. 2 day pass is a cost saver. I would suggest purchasing.

Not too much difference I do think it's a little better though and you need a food pass also or pay for food