Museum Passport Well Worth It
For $29 I bought a 4 museum pass, visited 4, and still was able to enjoy lunch on the grass by the reflecting pond, and a delightful hour in the dog park (even without a dog) watching man's best friend run and play with each other. Try to time your visit for a Tuesday when there is free entry to certain museums depending on which week it is. Make your first stop the friendly visitor's center to get the info on which museums are free that day and a map to get around. Plan time to wander the ALWAYS FREE Botanical Gardens around lunchtime so you can have a picnic outside on the grass in front of the Reflecting Pool and maybe catch a busker or two performing cheesy magic shows for the crowds. A great place for a take-out picnic lunch is the cafe near the Museum of Photography. They make fresh, delicious sandwiches on the some of the best marbled rye I've tasted. Sprouts are standard on the sandwich, so tell them if you don't want any. A lunch of a chicken salad sandwich with pickle, chips, and a diet soda was just over $7. Well worth it and better than a greasy hot dog. I visited The San Diego Museum of Art (don't miss the sculpture garden around the side of the museum), The Museum of Photography (which was showing the work of Ansel Adams), The Mingei Museum (which was disappointing and noisy as they were in the midst of setting up another exhibit, although they definitely had the BEST museum gift shop!), and The Museum of Natural History (really fabulous interactive displays that kids and adults were both interested in)
There were tons of school groups around and the Science Museum was too full so I didn't go there, I opened the door and the sound of screaming children sent me away, but it looked like they all were pretty engaged.
It was well worth the time and money I spent.