High Roller at Valleyfair, about 32 rides in one day, but I had to get off after each one. I wouldn't call it a coaster, but I rode "The Wave" (at VF) about 40 times in a row. But I had to get off of it each time too. There was nobody there, they were scared off by the thunderstroms earlier in the day.
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Cedar Fair hates valleyfair... boohoo.
2001: SFWoA,KCS,VF,SFEG,CP,BC
2002: SFMM,PKD,BGW,VF,KCS