Hi Sarah! The Tower of Terror race weekend is brand new, but I can definitely tell you what happens at the other runDisney 5K's. (It will most likely be very similar)
Your race will begin in the morning on Saturday. When you get to the starting line there will be a DJ and big screen TV playing upbeat music and getting you warmed up and excited! The race will begin in waves. The faster runners will be in the front all the way to strollers in the back. This is for safety reasons. There will be water and Powerade stops along the course. And of course, there will be lots of Disney entertainment and magic spread throughout the 3.1 miles! That's the best part of the Disney races!
The race course will have places for your family to cheer you on. The best place for them to be is at the finish line. Because this is a new race, I am not sure of the exact route. You can ask someone on the runDisney staff at the race for guidance with viewing areas.
After the race is over, you will be provided with post-race snacks, drinks, and of course, the bling of a new race medal. Not to mention the pride of your accomplishment! Here is a link to the
5K information for the Tower of Terror 10-miler weekend. Let me know if I can help you plan in any other way!