I found a few spots in SMG where you can simulate orbit using its wierd gravity ...things. I haven't played in a while and am doing this from memory so forgive me if I'm wrong about names and stuff.
In the galaxy where the first mission is to find Luigi inside Boo's mansion, you start out on the toad brigade's spaceship. Don't go into the launch star. Instead, run across the bottom of it- avoiding the launch star- to gain speed. Just before you round the outside edge and reach the top, do a long jump. If you get the right angle and don't hit the launch star then you can get a good two revolutions before you automatically just fall.
If you find any post em. Stuff like this adds to an unfortunately quick game's replay.