Pretty new to the forums here but i gotta answer this from experience, especially from being in both Army and Sea Cadets.
Cadets has given me the best times of my life, some things that really stick out are
Camp: CLI Adventure Instructor was awesome, simply amazing, 6 weeks too short. slept in tents for 5 weeks. Nutz!
C7 assault rifle and rappelling. These were nice to learn.
Field training, and eating in the bush.
I hated when i had to move, i was up for my Warrent officer promotion, NSCE testing and Marksman qual.
If i was still living in my original town, I would have finished all that stuff off. Went to staff ( I was accepted ) etc.