RTN- If you go at the weekends, the queue for the good rides is up to 90 minutes. Personally, I don't want to spend a whole day doing under 1/4 hour of rides. Go in the week and you'd be unlucky to wait more than 10 minutes.
That's because nobody wants to stand in a queue next to your sick kids.
Supplements, even steroids only actually speed up the time it takes an athlete to reach their peak, it does not alter their peak potential. I remember reading that tested(clever doping) competitions and untested(inject gorilla semen if you want) weight lifting competitions, saw almost no difference in recorders set in any weight category. Sure the steroid crew did it earlier in their careers but the honest (ish) lifters did the same feats of strength later in their careers.
That may be true of steroids but other PEDs (EPO, for example) will certainly boost your ability beyond its natural boundaries.