Thus begins the circus/dinosaur adventure path. That is such a cool premise, right there. So awesome!
However, book 1 is just... OK. The first three quarters of the book feel like padding to get you to the Aeon Tower and the main story arc.
Also, your circus is kind of boring. The GM will have to put some work in here to flesh out some memorable NPCs. There's some really cool art for different acts you can showcase, but nothing in the adventure, other than the mechanics for slotting them into the circus management mini game.
Speaking of; the rules for running a circus feel like they will be a total ball ache to implement. This could actually top the caravan rules from Jade Regent for 'most unrewarding waste of your valuable time'. Fortunately, the adventure states they can be completely ignored.
The art and general aesthetic for the adventure is really vibrant and fun. I think sheer novelty value boosts this book from 3 to 4 stars.