Outside of band stuff, is there anything Danny, Zoe, and Kat like to do together? What are some things they won't do as a group? Why?
Zoe has my heart, I love her dearly.
Outside of the band, Danny and Zoe do... well, everything. Although they tend to prefer more social -and especially musical- places like the park/amphitheater or the mall.
Danny likes to do things out of impulse, and Zoe tends to go with his ideas (because why not).
Despite this they're just as content staying at Danny's house and doing nothing.
Kat, on the other hand, usually has to work. More often then not they won't hang out with the two unless they're invited/dragged into it (by Danny) or unless the two end up at his job (...also by Danny).
((You can also likely guess why Kat keeps getting fired.))
And since you mentioned her here's a Zoe! :)