You tell Windcaller that you were thinking about spending the afternoon at the lake, and ask him what he thinks.

Windcaller: "I... have nothing against it."

Moonflower: "You guys go ahead, I'm gonna go buy some fire peppers at the market and catch up with ya in a bit!"

You exit the house. While you and Windcaller follow the road south to Mare's Tail Lake, Moonflower takes off southwest to the market.

A few minutes later, you reach a small sand beach on the southern shore of the lake. To the west, you find a rack with some volley balls, sand castle building kits, and other water toys.