I've been there twice. Once in 8th grade and once in 10th. It's a truly special place, and was always very interesting to see where so many boys fought and died.
It's even more special now that I found out this year that one of my uncles (also one of my only notable family members who participated in the Civil War) fought and died there. I'm jealous that you get to visit, I want to see the spot where he died...
Also do visit the Angle where Alonzo Cushing died! He's a very special young man

.