You cant ask us this question, its up to you. Only you know what you really want to start.

My opinion is you shouldn't decide what instrument you want to play, you need to decide what music you want to play. If you want to play Mozart, or Brahms, then definitely piano(in my opinion). If you want to be playing Country, or Beetles, then go guitar. If you like marches, or just having a beat, get a snare drum and work your way to a drum set. I do think you should start with one of those three. If you want classical, learn to read music, then decide if you want to do more. if you want more modern popular music, then you need something you can play alone (unless you have people to play with, then by all means, go with bass, or something less known)

vocals is always something to consider as well. a good way to bring music to your life is to join your church's choir, or to find a local community center with music programs. Marching bands are fun too.

the didgeridoo is pretty cool!!!
but maybe not as a first instrument.
i think the acoustic guitar is a good one!

the skin flute!!!

have you come to a decision yet?

hmmm well
i would say piano or keyboard because you can buy a keyboard pretty cheap its not hard to teach yourself you get to learn to read bass and treble clef music they sound great on there own or in a group and there are unlimited amounts of diferent styles you can play on them. pianos are sexy
but in saying that if piano doesnt feel right go with something else