I'm using a Garmin GPSMAP 60CSx. I set the tracking record mode to 'TIME' and set the interval to 00hrs00mins00secs and log the data to my SD card. I'm at work now, but when I get home I'll upload some raw Garmin tracks so you can compare 'em with yours.
I upload the data to my PC using a mapping program called OziExplorer
. I take a screen shot of the tracks and import them into PhotoShop to manipulate them.
The track is pasted into a new layer above the the background map. Pretty smooth to start with.
Then I trace over the Garmin track using the Paint Brush tool on another layer that has the track for the whole park. The track is wider and depending on my mousing abilities smoothed a little bit.
The layer with the Garmin track is then hidden.
I also have background layers with a satellite image and a somewhat cheesy topo.