I went to a survivor party 2 years ago. IT WAS AWESOME! The backyard was decorated with all sorts of fake bugs and spider webs which startled everyone at first. When everyone arrived, we were put into teams and this was shown using 2 different coloured bandanas that each team wore.
We played all these messy games (eg. an obstacle course where we had to crawl through mud, etc.) We also played games where we had to get gummy worms out of a disgusting mixture including: shaving cream, nuts, jelly, baked beans and all sorts of stuff. It was pretty gross.
When it became darker, we played a scavenger hunt where we had to find certain items and because it was dark, it was harder to see things which also made it more exciting.
The girl's house I went to, had quite a big backyard which made it easier to have this kind of party. I enjoyed this party so much and I thought it was so much fun!