How does Grandpa get a couple of reluctant little boys to be excited about going to Old Town, San Diego?
Tell them they are going to "Cowboy Town."
So what does Grandpa have to do?
Buy them cowboy hats.
Which he obligingly did.
How do you get little boys to sit still for a photo opportunity with cowboy hats?
With great patience.
And then you tell them about the BIG gun.
And the wagon.
And then you pretend you don't know the other people you are with.