Yep... take it out of the case...
The Etrex series are pretty well proofed against the odd rain shower. My Legend doesn't get 'molly-coddled'. It's a tool to be used and get used it does, come hell or high water. I wouldn't suggest that you go scuba diving with it but being used in rain certainly won't harm it.
I had a slight mishap at "The Romans Were Here" GCTAZF and my Etrex Legend spent 6 hours in 6 feet of water before being rescued. I shook out the water, replaced the batteries and it hasn't missed a beat.