u/Alternative-Letter36

Hi! I’m going to be in Seattle solo for one day in July. I’m flying in earlier in the week but staying a couple of hours outside the city. My friends are catching a flight home in the morning and taking my checked bag but I’ll still have my carry on. I’ll be getting the red eye home. Is there anywhere safe I can store my bag. Maybe lockers somewhere? I have no idea if this is even a thing but Reddit always knows the answers.
Bonus points if you tell me your favorite thing to do solo. I’m ok with touristy things. It will be my first time there.
Thanks!