i live in Nashville and can help.
PM me specifics and I should be able to give you a few things to do.
kid stuff:
ryman tour
adventrure science center
parthenon
nashville zoo
cheekwood gardens
frist art gallery
country music hall of fame (has a john waxman taco store that is supposed to be good)
nashville sounds AAA baseball
also,
broadway (the nashville strip) has music all day long and it is free to get in and kids are allowed until 7pm. tootie's is a historic bar that the likes of Cash, Nelson, etc.. used to sneak out of the ryman during intermissions to drink there. you can still see celebrities there at times.
depending on when you come, there are some sort of festivals/events all the time.
the hermitage - andrew jackson's (president) home is near nashville but a little drive
gaylord opryland is somewhat interesting, convention center but be ready to spend some $.
food wise is dependent on your taste
pharmacy burger, hatty Bs and pancake pantry...meh, food is ok but have to wait a long time. i would not recommend any of them, too many better options.
ambiance is good in pharmacy but go at off times (2:30-4pm). if you can't get into pharmacy (very long waits) we usually walk across the street to mas tacos. i prefer mas tacos anyway.
the gultch has really hot restaurants, and worth a look. parking sucks. there is this bluegrass bar called the station inn that on sunday's is open mic and a lot of local musicians go an play. worth the time.
warak