I would send a ship full of robots 50 years earlier to do all the mining and building. By the time the humans arrive, the place has already been turned into a giant 5 star hotel.
I think I saw something on Science Channel that basically said this. Most efficient way is to send a giant army of robots/nanobots ahead of time. You can accelerate them at much faster speeds and they will build all the infrastructure you need and do all the mining crap you need along the way, especially if you mastered replicating robots technology.
