I'm not sure about the recent AI models, but occasionally a rudder pin will break on the older models, you might want to pick up a couple spare rudder pins, just in case.
I have hit my mirage drive fins on reef a couple times and torn the flippers, you might pick up a couple extra flippers.
The drain plug on the newer models is at the furthest most point on the back of the boat, on the bottom, I usually have to lift my kayak so it pivots on that point. I'm usually doing this on concrete, asphalt, sand, etc...these things aren't kind to that drain plug, you might get an extra one of those.
Maybe a spare dagger board in case you run aground and damage it. I have an old fiberglass one which is more apt to be damaged, I'm not sure about the new plastic ones.
Really, there isn't much you need, the things I listed are all rare occurrences, the AI is a great boat that doesn't need a lot of replacement parts!
Good luck, have fun