The Energy Cafe is in a great location, with a large covered outdoor seating area. there's also lots of outdoor seating just a few steps away in front of the museum. (They do have indoor seating as well, of course.)
The Southwest Turkey wrap is great. My favorite. In addition to sandwiches, they also have smoothies, salads, juices, and coffee drinks. All healthy foods and pretty good tasting.
Unfortunately, no wifi as of this review, but sometimes you can snag a nearby connection.