Lots more variable than you're mentioning.
1. Will you and your husband be STAYING in downtown Annapolis for the day? Or is that too early? That's an important thing you need to decide.
We stayed at that exact place for I Day a year ago. Hubby and I took plebe-to-be with us. We drove the the stadium, parked. Caught one of their shuttle busses, took pleber to Alumni Hall, hugged him, saw him off, and then walked back to the stadium, got our van and went back to the hotel for a while. We had a crowd with us though. Several siblings, friends, grandparents, etc. They saw off our plebe the night before and in the morning. No one came to drop him at Alumni Hall except hubby and I.
You should know that there is NOT alot of parking in Down Town Annapolis (DTA). Leave the rental car at the stadium and take the shuttle.
You should know that you need to allot MUCH time on I Day. I think our plebe's report time was 7am. We aimed to be in the stadium lot no later than 6am. When we arrived, the lines for the shuttle were already 100 people or more long. It moves fast, but we were glad we arrived so early. Til we waited for the lines to move, rode the shuttle, etc, he was in good shape to report right on time.
After that, the day is yours. You could catch the shuttle to the stadium and go back to the hotel, eat breakfast, pack up, etc, and go back to the stadium for another shuttle to USNA.
If you want to just STAY in town after 7am, walk into town and go to Chick and Ruth's Delly for breakfast. Authentic Annapolis. Spend the day on the yard. Enjoy the atmosphere and try to adjust to your new life!!