I found my first squirrel yeaaaaaaaaaa. In the board: Park and Ride
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About 15 seconds in the track, there is a sign that lifts up, jump under it, you will notice a square that looks out of place. land on that ( you can eject) and just wait. a Cut scene starts and takes about 45 seconds to complete,
sitting on edge of the platform halfway through the track that tilts over to the right, then dunking in the water (Don't know if that is a necessary step) and then progressing to the end.
EDIT:
Found one in
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Ski or Ride
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Jump into the cable car with the open door at the end of second ramp. I was riding through and saw it thinking "that's just too good not to be a squirrel trigger"