With the schedule already out I am looking at going to the following places in June of 2012:
Boston
Baltimore
Philadelphia
Washington DC
Like last year once the minor league schedule comes out I will plan accordingly. Should be another year of great memories.
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Make sure you buy tickets to Fenway and Philly ahead of time as each sell out pretty quickly. Part of June is Interleague play so tickets may be scarce if you hit a Sox @ Philly game, etc. Just plan ahead...
They are 4 great stadiums as I have been to all of them multiple times. Any reason you are skipping the 2 in NY? 1 thing I would do is skip the rental car and just take Amtrak between the cities.