You could set up a minecart system, with a basic station-type thing that uses redstone, there's all these complicated ones on YouTube but you could come up with some sort of automated system if you had the time on your hands.
Saw another Fairly Oddparents pic and had to post. As far as Redstone things go, I like setting up different styles of Adventure maps. Basic traps are easy and the more complex things are hilarious to watch. For a survival world, alarm systems are fun, YouTube has some nice vids on them. My personal favourite Redstone thing I build in almost all of my worlds is extremely simple. A hidden vault. Just a piston door with a hidden button, but its still nice.