The Mystery Spot is pretty odd. You can't help to think that this place can't be much. There must be some kind of trick they are using. Well ... it's real. There's something funky going on.
The tour is short, maybe 30 minutes. It is entertaining though. The tour guides have a good list of jokes.
You will most likely feel the affects of the spot on your body. Try not to spend a lot of time in the specific spots so that you won't get sick. That basically means just walk 6 feet away and you'll start feeling relief.