I think all the 2-strokes vibrate like nuts, mine does. Some suspension helps reduce that a bit on the body. You can get, springer forks, suspension for you handle bars, and seat post suspension.
If you have fenders on it, you will want to re-enforce them.............there's some good threads here for that.
Outside of these things, you can balance your crank and some guys do that. All in all, for the money (very cheap) a 2-stroke is a great way to go, but there again, you get what you pay for.
A 4-stroke will give you a smoother ride and better reliability, but it will cost much more.