TV show tapings are a blast! My suggestion is similar to the others. Get there earlier than you think you need to, and plan on spending a lot of time waiting. I have worked in the television industry and our favorite saying is "Hurry up and wait." Seriously, get there early and be prepared to wait, wait, wait. It is worth it, though! Especially if you want a sort of "behind-the-scenes" look into what it takes to make a TV show. Some of the really fun ones are game shows, but those would be all morning activities. Tvtickets.com is the main website, but if there is particular show you are dying to see, check the show's webpage and see if they have any info. The popular shows tickets go really fast.
Have an awesome trip!