We've also got our boat a Cameron Marina (You'll see it from the slipway) - and love Loch Lomond. Islands will be fairly busy on a good summer day but all the more fun. You should try camping on one of them. Can't beat it! Just make sure you don't lose control of your boat too near the golf course

clicky. Plenty of places to eat dotted around. Inchmurrin, the Cruin, Luss, Rowardennan to name a few. Just be careful with your speed in the limited bits - patrol boats like to hide then jump out on you. Feel free to ask for any more info!

Edit - You can also check out the weather here before you go - webcam