Well, i am currently thinking of working on a challange server, which is very optional so no one can ever get clogged up in the first level since there are three different ones. It would be divided into three parts, one would be Mystery based, which is finding stuff, answering questions, etc. then the next is Platform based, meaning wall climbing, bouncing, jumping. then the third will hopefully be very legend of zelda like - with a lot of puzzles and traps.
I've drawn a few concepts, and they look pretty good so far.