The first time the hubby and I saw a "roundabout" was when we went to Cairns, Australia for our honeymoon. Coming from an island that only had stop signs and not too many signal lights on a 4 lane highway, it was a bit perplexing. We "maybe" drove around it about 3-4 times like Clark Griswold looking at "Big Ben... Parliament.." until we figured out what to do.
Here's the video of Clark just to refresh your memory. https://www.youtube.com/watch?v=iAgX6qlJEMc
Simply a small tube hanging from an evergreen tree. BYOP to sign the itty bitty log. Be stealthy since you're surrounded by a neighborhood. Happy caching! 
Congrats to KCSearcher for FTF!