I took Tang Soo Do (A distant relative of Tae Kwon Do) for 2 1/2 years and just started taking Tae Kwon Do this past week. I love it!
But the thing is, you have to find a school that teaches it the way YOU want to learn it! I know many people have already stated this in this post, but I feel that it cannot be stressed enough!
There are A LOT of Tae Kwon Do schools out there and some teach it as a "sport", while others teach it in the traditional way as an "art" and some schools balance out the two.
Some school's focus more on sparring, others on forms, some on both.
Take everyone's advice and sit in on some classes and take up any trial classes made available. Take your time in choosing your school becuase it is a life journey and you don't want to make the same mistake I did by attending a school that, down the line, will no longer fit your needs or agree with your expectations!