This is my first Minecraft world.
I haven't done a whole lot here so don't expect anything amazing to be built here.
I do have a descent mob trap/spawner that starts on a grassy surface (so I can get friendly mods too) and then has multiple layers of darkness to generate mobs during the day. It's probably not the best design but it generates more than enough stuff for a single player environment.
I also have a pretty long minecart track setup between my main base and the new base that I arrived at when coming out of the Nether. I think I clocked it at 2-3 minutes of riding to get to the end :)