I live real close to Albany and its a nice city!
If you are going to be downtown, the whole day can be spent there, you can go to the State Museum and do the tour of the Capital Building and go to the Top of Corning Towers, (I took my son and nephew on the tour a few years back, I quite liked it, lots of history and a good tour! Go up to Lark Street for a wander round, there are a lot of funky little shops/bars/restaurants ..... Thats probably your best bet, if you just have the one day, spend it downtown
Or
If you want to spend the day shopping there is Crossgates Mall (big indoor shopping center)
or Colonie Center (medium sized indoor shopping center)
Or
I don't know if you have a car, but you can head up to Saratoga and treat yourself to a spa at the Roosevelt Baths in Saratoga Springs and do lunch at the Gideon Putnam Hotel next door (went up there in December for a little mini break, ohhhh it was nice)!!!! and shopping in downtown Saratoga, lots of nice shops on Main Street, go the casino, Saratoga is straight up the Northway from Albany, not a far drive at all, so thats a nice way to spend the day too!