For me, my favorite ballpark trip was to Lexington, KY (Lexington Legends). I've been to 4 games there. Good ticket prices, good food, all the seats are nice and up close. Parking was a breeze as well (if you get there in time).
For a Bull Durham experience, it was the Richmond (IN) Roosters, formally of the Frontier League. Hardly anyone was in attendence, $3 tickets, $1 coke and hotdogs. Made for a nice, lazy evening.