The first thing I do when I get home from a photography trip is go through my photos and start getting rid of stuff I know I won't use. I am viscous with this. I have plenty of photos and memories so I don't need to keep things around, "just in case". From this last trip I had over 2000 images. I am not quite done with my first pass, but I am down to less than 1000 on disk.
Some of the images are in the category of "what were you thinking?" While others are just plain failed attempts at art. If I walk away from a trip with 6 images to show, it's been a really successful trip. Besides for these photo workshops, it's the people I meet that make them a success for me.