I would suggest going at any "off time" since you are a large group. It is a very small place with a few booths, a few seats at the counter and about 5 round typical soda shop tables in the middle...it'll be hard seating the group together probably.
The Kitchen Sink is wicked!! It (or at least ours) had a pool of hot fudge, caramel, and peanut butter sauce on the bottom, vanilla, chocolate, coffee, strawberry, mint chocolate chip ice creams, topped with an entire can of whipped cream, chocolate chunk sprinkles, rainbow sprinkles, a couple oreo cookies, a couple fudge brownies, a couple banana nut muffins, a couple slices of angel food cake, a milky way candy bar cut in half, practically an entire jar of marichino cherries, and drizzled with chocolate syrup.
Here is a photo of it from 12/23
and here is the damage DH, DS and I did...mind you it was our lunch!!!
Okay...we didn't eat all the muffin, brownies, oreos, candy bar or cake, but man it was fun! They did dim the lights and announce that a group of little piggies had ordered the kitchen sink and proceeded to tell what was in it. Everyones eyes were as big as the sink as it came to our table. And hey, it was cheaper than ordering 3 separate sundaes.