That's a tough one...
Could be riding with my dad or brother with my hubby. My 1st track day, sweeping for the epic ride, gap trip.... So many.
So, I will say every time I ride and have a new experience becomes a memory.
As for upgrades... My Brocks exhaust system.
I love riding and my focus on schooling is so I can ride more in the future.... So I an afford more track time