First thing for idle issues is replace the spark plug with a properly gapped plug. Check the coil output and flush the fuel system with SeaFoam. Small displacement engine’s that are run at low rpm’s for long periods need periodic checkups.
My recommended snorkeling spot might be a bit more of an adventure than they ( or Mom ) are up for. It’s open water and not really splash and giggle
One place that they would enjoy is the Sea Horse farm. They raise them from birth to adult stage. They will be able see and hold the Sea Horses...
Best snorkeling is not at a beach. Shore break waves cloud the water with sand. Go south from kona to Kealakeku
State Park. Snorkel Bob’s or any dive shop in Kona can give you directionsl. Park in the park and walk past the boat ramp to the lava flow , easy entry to the water at “2 step”. You...
I may have , but with all the other voices and noises that I have in my head I might have mistaken them for the neighbors cat that was either in heat or was eaten by a coyotes.