Hey! I went on two CVWs (once as an applicant, once as an appointee). Above advice is spot on. I'd maybe be a bit formal on the first day (when you'll be in front of Admissions Staff). Jeans are plenty acceptable once you're shadowing your host. There are no formal evaluations, but you never know who you'll run into and if they will remember your name. If they do, it helps if your impression was positive!
As to activities, it can vary. Sometimes the Brigade/Battalion/Company will have events that drags can participate in (Random parties, sporting event, etc.). Sometimes, it will be a quiet week with nothing of note going on. Sometimes your host will hand you off to a classmate for a bit if they are have something where it'd be difficult for drags to participate or you want to see something they don't do. (Ex. If you want to see track practice, but your host is a NARP, they might hand you off to someone on the track team in their company.). You're not restricted to your host. Don't be afraid to ask to see things. There are also some activities that drags cannot participate in for liability reasons. A common one is log PT if you go to morning workouts.
Advice for CVWs in general: attitude is everything! Again, while there isn't any formal eval, Mids will look at you as a future Mid. Being nice and humble goes a long way! Hang out and play ping pong, joke around, tell us about yourself, etc. However, nobody is impressed with your high school accolades or all the JRTOC medals on your uniform. Also, be honest. When I hosted drags, I made it a point to actually sit down with my drags and get to know them and what they wanted in life. Being honest works to you benefit. Everyone wants you to make the best decision for you. If the Academy is not #1 on your list or you're not feeling it in general, totally fine. That is what the CVW is there for. That conversation can't happen unless you're honest. Also, for those who want to wear a CAP, JROTC, or USNSCC uniform, I'd personally refrain. It kind of paints a target on your back.
Lastly, the Academy is not militaristic in the way those fine organizations make it out to be. No need to say Sir/Ma'am every other word, snap to attention, only speak at ease, etc. There's definitely a time and place for customs and courtesies, but the day-to-day is more relaxed and less robotic.