I'm DMing my first campaign in D&D 4e using my own setting, and I need to create some random encounters throughout the map surrounding the starting village. I only have a week available between sessions for DM prep, so I can't invest an awful lot of time in creating encounters.
So far, all I've thought up is having a nearby "Twilight Henge", which is a Stonehenge-like ruin where the Feywild leaks into the surrounding area, and it's turned a local elf into a Weresquirrel who will draw the characters into a squirrel ambush. This isn't enough though, and I need to create more.
What is a good way to create quick, random encounters my players could come across in the wilderness? What techniques do you have for creating something interesting, or what resources could you suggest to me for creating/using pre-made puzzles?