[Chekov doesn't understand Harry's nervousness. He isn't nervous. In fact, Harry makes him a good deal less nervous than everyone else here from their world (with the exceptions of Sulu and, usually, Uhura). Unfortunately for Harry, this lack of nervousness makes Chekov chattier than he would be around their superiors.]

It has been years for me, also. My papa used to take me to Kotlin Island, in the Neva Bay, before his working season became too busy. It wasn't very warm--twenty degrees at the warmest, because it was only early summer--and I was unappreciative of his critiques of my architectural skills, but I enjoyed it, and this reminds me of that.

[He gives his sand church another once-over and, deciding that he doesn't really want to fight with the cupolas, moves to a new patch of wet sand, gesturing for Harry to come along.]

Yes, please give it a shot? If you don't enjoy it, you can go. I will even help destroy any evidence that you tried and failed horribly.