Go check Minor league A level attendance by their leagues
stats:
Midwest league 16 teams.
http://www.milb.com/milb/stats/stats.jsp?t=l_att&lid=118&sid=l118
10 teams with average attendance > 3000/game
6 teams with average attendance < 3000/game

There is in fact nothing else to do near or around these host cities.
Now check this out:
http://www.milb.com/milb/stats/stats.jsp?t=l_att&lid=123&sid=l123
Florida State league (Single A as well) 12 teams total
ALL 12 teams with average attendance < 3000 per game

Thats a stunning statistic for you and some of them have new or newly renovated stadiums.

Vog