It all depends upon what you want to do. I know you have a list, but honestly all you need for baseball is a major or minor league stadium. I'm not a fan, but do enjoy a good minor league game and those stadiums are everywhere.
You wanted food and that is not quite specific enough. In a metropolitan area you can get all kinds of restaurants from almost any ethnicity. In a smaller area you get regional cuisine.
As far as beer you cannot go wrong in several states. I tried to find a list by state, but every one I saw was wrong including this one:http://www.brewersassociation.org/statistics/by-state/
FWIW - North Carolina is sitting at 125+ at the moment.
You will have to drive no matter where you go, the US is a big place and we don't have good public transportation.
Since beer and food is one of your goals I would suggest you fly into Charlotte, NC and then drive to Asheville, NC and spend at least a couple of days. The reason why is you can see several breweries in a very small area. Sierra Nevada is close by, Oskar Blues is close by, and New Belgium is under construction. From there you can visit many midsize all the way down to nano breweries. The food in the area ranges from local Southern to ethnic, there is not much white tablecloth, but there are some definite foodie joints. They have a minor league baseball team. The weather is never bad, sometimes rain can diminish the fun, but it typically doesn't hang out forever. Asheville is in the Mountains and within ~6 hours you could visit the beach from there. Asheville to Washington, DC is ~7 hours with much of it through some pretty mountain scenery. The NC beach to DC is about 6 hours, but the drive is not nearly as scenic, although Richmond, VA has some nice breweries and Green Flash should be settled in to the Tidewater area of VA soon. Also Stone is building a brewery in Richmond and I hear it may be in production by the end of the year.
California is a great place to visit, but it is a large state and not much is walkable. Washington and Oregon have a plethora of breweries as well. Wisconsin is very pretty in the spring and summer.
It all depends upon what you want to see. Washington, DC has the monuments, NYC is well, NYC, we have almost every climate under the sun at some point in the US and everything from flat land to mountain peaks.
Once you know kinda where you are heading I'm sure the group can put you on the right path or help with arrangements in the US.