Neptune does have a special feature, the "Great Dark Spot," a giant storm that has raged on since the discovery of the planet. Though it's axis is not tilted very much, not giving it any extreme seasonal change. Many types of spacecraft have visited this planet, finding many interesting things around and about the planet. The orbit of Neptune also does cross with Pluto's orbit, but this is due to Pluto's unusual orbit.
Things to Remember: Neptune is the farthest planet from the sun, so it will be extremely cold. Though, it is very much like going into an ocean of pure water, but feels like air. It's like a marine-fanatic's dream! You might always remember how the planet goes so deep in, that you could walk for about 5 hours and make it all the way around the center core!