For peaking I like the day off two days before and then a short and very easy shake out the day before. Three days before maybe a course preview of the last X number of miles?
Everyone is different. I personally did my best with a lighter week before the big race, return to a bigger week and a 48 hour taper. Any longer I felt flat.
Why would you go crazy days before your big race? A freshman kid I coached went out two days before and ran the state course two days before to “get to know her pace.” She bombed. She ran the race before the race. She was 14. I am assuming you are a grown adult and know that is not the best thing to do and can control yourself? If not don’t get on the bike. Nothing you can do a few days before your race to make you better… but there is a lot you can screw up.