I was in the ACO for over 3 years - reaching Sergeant.
My squadron was nothing like you describe. We usually spent the first half-hour or so doing drill, then lectures/activities for the rest of the evening (with a break, of course).
If it was a sports night (usually once a fortnight-once a month), we'd usually do dodgeball (we had a lot of grassy room in the 'front garden'), or football. We sometimes did circuits, but not usually for more than half of the night (other half would be fun stuff, like dodgeball) - this also tended to be once every (good) few months - in the 2 years I was at that squadron, I probably partook/oversaw/was doing something else while circuits were on 5 times, maybe less, maybe (unlikely) more. We much preferred lectures, drill and cleaning (yes, we preferred Greens nights!), well, I did, particularly as an NCO!
I'd say stick it out. Speak with other cadets and NCOs - if you're friendly with them (they are usually very friendly - far more than they appear). Or if there's an AWO, speak with them. Just politely converse about what other stuff the squadron does on parade nights.
Feel free to drop me a line if you've got any questions regarding the ACO (or anything else). If you've not already, you may want to join the 'You Know You've Been An Air Cadet Too Long When...' Facebook group. That page is full of good tips.
Especially AP1538C! If you haven't already, wait around yo experience BADER - it's a magnificent website (it's very odd - ask any NCO!)