My wife and I have so far spent two days in Milan and have hiked the Cinque Terre trail from Monterosso to Riomaggioro (which was quite a feat). We're now headed to Venice. After that we'll be in Vienna for a few days.
After Vienna we don't have certain plans. We'd like to go to Prague and then to Berlin. I'd really like to hit up some Scandinavian cities. We fly out of Paris on the 12.
Put away your phones and computers and go explore. Have lots of romance. Make friends with locals and other travellers.
Eat.
Ride bikes.
Hike.
Find a live band, tell them it's your honeymoon and ask if you can sit in and play your wife's favourite song.
Introduce each other as "my wife" or "my husband," whenever possible. After this honeymoon that gets less "new" feeling.
Drink lots of wine. Get good bottles. Drink champagne too. This stuff is way more expensive once imported to US.
Spend time in a very nice hotel with a comfortable bed and some champagne. -use your imagination from here.
Go swimming
Ask people about their favourite bands etc. and see lots of local music.
Dumpster dive. -just to say you did.
Definitely get off of Hubski/Internet.
Report back.
Congratulations my friend!! Knowing you, I have no doubt You will have an awesome marriage.