Yep, nose clips are where it's at. Here's the homemade article Dave refers to:
http://www.outdoorplace.org/paddling/Odds/Nose-clips.htm

I prefer a dive mask when the water's clear and there's stuff to look at.

Some folks can keep a steady stream of air coming out their nose and don't need nose clips. I sure wish I could get good enough to shed 'em, but until then, they're my friend.