Since I am visiting for the first time in early march, what are some things that I shoild be sure not to pass up? In the area of downtown would be best.

Unless there is something worth seeing elsewhere.

Go see a show at the Ryman Auditorium - the BEST venue in the country. The locals hang out at 3rd and Lindsley music venue. It doesn't matter who's playing at the Ryman or 3rd and Lindsley. They will be great! Eat some Hot Chicken at Hattie B's. If you like to hike, there are tons of beautiful state parks that have great hiking trails. I hope that helps!