Replying to Ideas for a casual date?

so there's a girl who might be interested in myself. and i can tell you that i am interested in her.

so we're hanging out when i get back in town. and when i asked if she had any place she would like to go or anything she would prefer to do, she just replied, surprises are good :)

so i have to come up with something. and i am also stuck deciding on how date ish this day is going to be.

so what are some casual things to do for a casual date and not make it super date like.

park, walking around or picnic
flea/farmers market
art museum or something
beach, even tho there's not much to do at the beach
some sort of concert at a park


any suggestions would help.

this would be in LA area