I have three days in Brooklyn. What must I absolutely see and do?

...Yep, I'm back! If you do Brooklyn Brewery, stay put in that neighborhood (Williamsburg) - that's where you'll find scores of vegetarian restaurants, for starters, but you'll also find a lot of funky vintage clothings stores, record stores, a handful of indie bookstores, and a few other food manufacturers (http://mastbrothers.com/ is in a warehouse nearby the Brooklyn Brewery and you will never smell a more amazing store in your life). Another fun neighborhood to explore is http://en.wikipedia.org/wiki/Red_Hook,_Brooklyn - they also have a few funky food shops and boutiques, but only a handful of restaurants (one of which is http://bakednyc.com/ this amazing bakery that's gotten so huge they now have a deal with Williams-Sonoma). Red Hook is a little scruffy-looking, and got hit REALLY hard by Hurricane Sandy, but it makes for a cool stroll. (If you do go, take a walk over to http://www.nycgovparks.org/parks/valentinopier/ for some amazing views of the Statue of Liberty.)

Vinnie's Pizza has some delicious vegetarian options.

Greenlight Bookstore in Fort Greene. If you're here on a weekend, check out Brooklyn Flea (artisan and vintage and local food market in a gorgeous old building). Do swing through the park, especially if it's springtime when you're here. Again, I don't know when you're here, but if it happens to be during Bushwick Open Studios, check that out. It would be helpful to know when you are here and where you'll be staying.

http://www.yelp.com/biz/bookcourt-brooklyn and the http://www.mta.info/mta/museum/.

http://www.difara.com/ is the pizza place in Brooklyn, as far as I am concerned.

Brooklyn has about seventy billion art galleries these days, and you could easily spend the entire three days seeing them. There are good maps here: http://wagmag.org/, I would recommend concentrating on Williamsburg and Dumbo neighborhoods. Both are really pleasent neighborhoods to walk around in too, chock-full of cute coffee shops and restaurants. Unnameable Books is a nice walk from the Brooklyn Museum, and is by an adorable ice cream shop (Ample Hills) and some cute restaurants and bars.

Sorry, I didn't see mid-February. So scrap the Open Studios idea :)

Robertas for pizza.

The http://www.bbg.org/ is literally right next door to the Brooklyn Museum, and is compact enough that even when everything's in bloom you could "do" the whole thing in just a couple hours. It's warm enough out in mid-February these days that you may be able to see a few early buds outdoors; even if they don't, the garden has a decent conservatory, with a nice little bonsai collection. And all of that is right near Prospect Park - which is home to the http://www.prospectpark.org/lefferts which is a bit on the kid-friendly side but still kind of fun. And the http://www.prospectpark.org/visit/places/zoo is right next to Lefferts House. In fact, all of those things are within walking distance of each other, and are compact enough and inexpensive enough that you could do them all in one day - hit the museum first, then the garden, then use the Ocean Avenue exit to the garden and you'll be right across the street from Lefferts' House; hit that, then walk to the zoo right next door. It is still a fairly busy day, but not overwhelmingly so. If you want to split that day up a bit - Prospect Park also sports the http://www.prospectpark.org/visit/places/audubon which is housed inside a building that's got National Landmark status. At the northern tip of the park (also within walking distance from Brooklyn Musuem, actually) is http://www.prospectpark.org/visit/places/gap boasting a boffo memorial arch. On the weekends, the plaza also boasts a very active farmer's market. And right across the street from THAT is the main branch of Brooklyn's http://www.panoramio.com/photo/1664598 which is in a funky art-deco designed building that's meant to look like an open book standing up on a table. Greenlight books (mentioned above) is very near the http://www.bam.org/ where you can see theater or dance; there's also a cafe with live jazz, and a movie theater. (Fair warning that it's also very near the Barclay's Center, a big horkin' sports-and-music-arena-stadium-type-thing, so if you plan on driving, parking would be a challenge on game days.) I suspect that you won't have any trouble finding vegetarian restaurants in Brooklyn - in fact, you may want to narrow it down a little (vegetarian Asian? French? Italian? Soul Food? Vegan? Gluten-free? It's probably here).