Saraghina is great for brick oven pizza, homemade pasta and overall tasty, homey Italian food. I highly recommend it.
Chavellas is also very good Mexican. It's a good spot for brunch/carb load-up before hitting the CM frenzy. It's cozy spot, although they are expanding in a new location on Franklin, so get there early.
Tom's Restaurant on Washington is a landmark diner spot but, beware the lines. It's longer than the one at the CM on a free Saturday.
None are next door to the Museum but in easy driving distance.
732 Classon Ave, Brooklyn, NY 11238
782 Washington Ave, Brooklyn, NY 11238
435 Halsey St, Brooklyn, NY 11233
The museum is pretty much in the middle of a residential area so there's not much within a few blocks. They do have a café. Notice is required for groups larger than six. Take a look at their suggestions for food: http://www.brooklynkids.org/index.php...
145 Brooklyn Ave, Brooklyn, NY 11213