You mention water skiing in Moses Lake - However whenever I have visited the lake is full of algae scum. It's a rather stagnant lake. Not anything I'd want to swim in.
And the weather? It gets very cold in the Winter (down around 0 is not unusual) and very hot in the Summer (100 is not unusual this time of the year). And it's a desert landscape without much of anything interesting. There's a park nearby called the Potholes Park (sounds just lovely). Lots of farms around so you can get plenty of pesticide spray wafting your way (one of the reasons my parents want to move - it has become enough of a problem that it's effecting their health). Oh and then there's the Hanford Nuclear Reservation not an hour away - lot's of glow-in-the-dark fun to be had there!
No, Moses Lake is not the beauty spot you make it out to be. I actually find it to be one of the most depressing places I've ever visited - but maybe it's partly because I prefer the green side of the mountains.