I'm thinking of deciding to go to the museum alone while my friends go to eat
What makes you not want to eat with your friends?
Because I want to go to the museum, I hate eating out.
You shouldn't go off and do your own thing just because the rest of the group wants to eat. Even if you don't like eating with them, at least stay together as a group.
I'm not really that close to them anyway.
It would be a good way to get to know them too. You should give people a chance before blowing them off entirely.