Like at every noteworthy speakeasy, it started with a knock.

After Chad Thompson and his wife, Kitty, found the secret door in an unassuming section of Citi Field, home of the New York Mets, they faced one more test that day in June before securing access to perhaps Major League Baseball’s most exclusive new fan experience. They needed to recite the correct password. It had three words.

“Let’s go Mets,” Mr. Thompson, a resident of Manhattan, told the guard.

The couple walked into the Cadillac Club to catch a game between the Mets and their crosstown rival Yankees. Once inside, the Thompsons snacked on bacon-wrapped dates and complimentary glasses of prosecco and Glenfiddich 15-Year-Old Solera Reserve. They sat in plush brown leather seats with personal TVs attached, where they were served Shake Shack burgers and Häagen-Dazs ice cream bars.

1. Petco Park - San Diego Padres

We really shouldn’t be surprised at this point because Petco Park truly is the perfect ballpark. It’s embedded right in the heart of downtown San Diego with the skyline basically on top of you. There’s a community park that leads right into the outfield concourses, making it a cool place to check out even on non-gamedays. Petco Park has the best food and beer selection in baseball to go along with the top-notch location. And now that the Padres are among the more exciting teams in MLB, the game-day atmosphere measures up with the stadium itself.

It’s really difficult to imagine any stadium topping Petco Park — it’s simply the best.