Where are you building them? If you're going to do wimpy ones count me out. If you're going all out and making them so big they could crush little kids (that's not my intention, I just want them that big) if they fell over then count me in! Do you have a truck with a plow or shovel scoop ready?
I'll dig a big sand hole
I love digging till I hit water and then just playing in the muck.
And makin big lounging chairs out of it or a couch or Imaginary hot tub.
Great place to drink on the beach without everyone seeing you