As for the adult fun; a small cooler that can fit in the cockpit is good and a water proof flashlight are good for night sailing. As for the wind vane you could install one but I wouldn't as it will eventually get broken off.
User your ears and eyes and other senses to figure out where the wind is coming from. You don't need a windex or vane as the single sail tells you quite well where the wind is coming from.
A Sunfish will help you make a new sailor out of young folks you know better then any keel boat.
"The cure for anything is salt water~ sweat, tears, or the sea." ~Isak Denesen
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