I too like filling up my time. It has gotten to the point where I typically get less sleep during the summer
To fill all of that valuable time I enjoy:
Swimming
Working as a Lifeguard
Working on cars (66 Mustang and a 63 Datsun Fairlady)
Arduinos
Martial Arts (recently replaced by the gym, the TKD studio isn't open late enough
)
Edit: Forgot to add photography
Oh... I almost forgot CD and Reddit, I still somehow find time to browse both of them.
Edit: Also adding pics because... yeah.
The Cars
The back half only, the front doesn't exist... yet
Martial Arts (Karate from a long time ago)
And photography. Not my best, but my favorite
Hopefully this post isn't too big.