I think it's kind of subjective - if you are used to riding roller coasters of all kinds then the local theme parks (fun as they are) probably won't give you the rush you're looking for.

Paddling the river could do it if you're not used to low-class rapids (depending on which parts of the river and what type of boat/trip you take, also the flow rate).

Otherwise, there's skydiving options within about an hour or two in at least 3 directions from the city.

Or, perhaps you get adrenaline from other means - I think there's a local improv comedy workshop around that eventually has you performing live.