Congrats on your appointment, but I am going to open the firestorm here. Think long and hard before you hand that back. It is honorable you want someone else to have that opportunity, but think about the what ifs first impo.
Many appointees hold onto the scholarship because the minute you take the oath on I Day is the minute the scholarship is revoked.
What if ... at your graduation party you play volleyball and break your wrist? I Day is 4 weeks a way and you will be in a cast for 6 weeks. What do you do now for the fall because you can't go to CGA next yrs due to being a medical turnback. What if ...you are on the baseball team and get injured. What if...you get mono the week before? What if you fall as you are getting off the bus on I Day and twist your knee?
Believe it or not all of those situations have happened on this forum. I am willing to bet not one of them thought they would be the what if appointee, but there they were. Now, if you don't need the money to go to your plan B school than I would hand the money back. However, if you do, well you might want to rethink contacting them.