The whole thing. Highlights include: tossing Klingons down laundry chutes, an insane computer with a milkshake fixation, the barbarian tribe that captures Sulu and McCoy and promptly breaks out into a Broadway musical number, the Klingon film noir fan, and last but not least, the Klingon vs. Starfleet pie fight.
Blueberry, Kirk thought instead of ducking. Splat. Blueberry it was.
McCoy explaining why he, Sulu, and two Klingons won't Kneel Before Zod (the evil queen):
McCoy: You see, ma'am, these two gentlemen already have a dictator, it's against Mr. Sulu's religion... and I'm a Democrat.
McCoy demands to know why Sulu woke him up to go on an adventure at dawn. He asks why he didn't go to Chekov.
Sulu: I tried Pavel's door first. Whatever he said to me was all in Russian. I understood the gestures, though.
The Scotty vs Klingon golf match. Chekov and another Klingon are caddies. It all culminates in the lot of them being fired at, and Chekov and one Klingon rushing into battle with golf clubs while Scotty and his opponent grumble good-naturedly about their younger friends and follow.
Through a series of complicated events, Kirk ends up locked in a closet in a cat burglar outfit which is much too small for him. He breaks out of the closet, tearing the outfit in the process. He takes the destroyed costume off, but isn't too happy about the prospect of running around a hotel in undershirt and shorts. The only other article of clothing in the closet is a dress. However, it's also torn, which brings us to this line:
He took a long look at the red dress, was rather thankful it was so badly torn up, saving him a tough choice.
So apparently, if the dress hadn't been torn, Kirk would have seriously considered wearing it around the hotel.
The book provides exposition on dilithium via what can only be described as a demented cross between an infomercial, a filmstrip presentation, and a Bill Nye-style popular science show, with rampant Product Placement (thanks, Deneva Inc.!).