If you play Piano you still have to learn the technicalities of each individual instrument, but the solid musical foundation of Piano really does make learning other instruments a breeze. The hardest part about music is learning a new language (note reading, theory etc.). Piano really is the way to learn that according to my experience. Then the only thing you have to do to learn a new instrument once you know the basics is the application of the musical language and how to execute the music according the individual instrument. (Not saying that isn’t hard work.)
Many people who “learn” to play guitar can never move much beyond the basics because they only learn chords from tab. If you learn piano, or take some classical guitar you won’t be held back from whatever you may want to pursue.
Ultimately, practice efficiently and have fun! =)