We're behind the beer-ball here but we're getting better.
NOLA tours are ok but don't expect much. They have a nice, new tavern/tap room as well as a tasting room.
There's a few places in the metro area to get some good beers. Courtyard Brewing is small and almost large, garage like but they have about 8 of their beers (always changing) as well as some of the more popular craft beer.
Second Line is also garage like and really new. I was blown away by how good their beers were. Not too many on tap yet but they vary as well. I've enjoyed a nice Russian Stout, cherry saison as well as a better than average IPA.
The beer bars to hit are Cooter Browns near the river which has tons of taps and fresh beer as well as a large selection of bottles and bar food.
Then my favorite OLD place is Avenue Pub on famous St. Charles. You can even take the scenic streetcar which stops less than a block away from it. Depending on when you go (later afternoons) there's a balcony overlooking the Avenue that you can enjoy.
Further outside of town are other breweries but they require some traveling. More info here:
http://www.beeradvocate.com/place/city/11/
Hope you enjoy your stay. It can get warm even in April as well as humid but this year with El Nino, we don't know WTF the weather is doing.
Oh, and it's crawfish time as well as the free French Quarter Festival with tons of music and awesome food!
http://fqfi.org/