whynotfly wrote: If I didn't see a pretty good open meadow or gravel bar, I think I would go for the lake. Any thoughts on that??

I don't fly floats or over water much, but a few years ago I went to a ditching training exercise. It was conducted by the Coast Guard, and held in a high school pool in Anchorage. I'd say between 50 and 100 other pilots turned out.
You put on a kayaking helmet with pretend headset cords. Then you climbed in a PVC cage resting in the water, with a mock seat, doors and plexiglas windows.
Next you fastened a 4 or 5 point harness, and gave a thumbs up to two burly Coast Guard guys, who flipped the cage over and gave it a really good shaking.
The two things that stayed with me are:
1) Grab hold of the seat between your front legs and keep hold of it- this is to give you a frame of reference when everything is suddenly wet, upside down, and moving violently.
2) Wait for all the violent movement to stop before you try to unbuckle, kick out windows, egress, etc...
-DP