While in Miami on business, I had some free time and discovered that they offered ballpark tours and decided to go on one. The tour cost, $10 per person and runs about 1 - 1.5 hours. You start off by gathering in the lobby of their executive offices and talk about plus and modern! From their, you get to tour the ins and outs of the park, the suites, media room, lockerroom, back hallways, pretty much all the spots you wouldn't normally get access to on game day, and you even access to the field and dugout area. The tour was very casual and so was our tour guide, but he provided great information. As with any attraction tour, it always ends at the Marlins store to fetch souvenirs. Even if you're not a Marlins fan, anyone who appreciates baseball or architecture will get a kick out of this tour. Parking is abundant (non-game days/off season) on the curb and is free. Also, there's an overpriced sandwich shop located by the Marlins store and that's pretty much as far as food options, so be sure to eat first. Lastly, use the bathroom before the tour, it's also by the store.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.