Berry Nice sounds good and so do Papaya, Blackberry, Mint Chocolate Chip. Heck, I'd even be down for trying the Earl Grey. Cucumber Mint...? Um, maybe not so much, but 6 out of 7 are good odds.
From the looks of their menu online it appears that the daily custards for June are the same for the Madison Square Park and Upper West Side locations. I wonder if the Upper West Side will have any special concretes like last month? That Lumberjack Concrete was darn, darn good.
Shake Shack Madison Square Park 23rd Street and Madison Avenue