You can do limitless things. Go to space, drive a car, shoot a gun, wield a fricking lightsaber!
Description
This modpack allows you to play Minecraft in an entirely new way. Explore to find new structures, new bosses, and especially new ores. You can even explore new planets.
The Galaticraft Legacy mod allows you to build rockets to explore new planets.
The ProjectE mod allows you to use EMC value to transform items through a transformation table. (Doesn't support all mods.)
There are many more mods that you'll just have to explore yourself.