I rode a ride in "bakken" (Denmark) called "Enterprise" 10 times in a row.
That might not seem so special but considering that it was just a huge wheel that made 360 degree rotations, with 5 full rotations per ride, making it a total of around 50 complete rotations in under half an hour, it still made for a great, and somewhat heinous, personal record. Weirdly enough, I didn't even feel sick afterwards, just really tired.
Other than that, I rode the Aerosmith roller coaster in Disneyland Studios Paris 13 times in one day. 8 times in a row at first and then 5 times in a row later in the day.
Anders "Guts of Steel" Frederiksen