2.5 years old will not remember this trip. Where does the parents want to go and have not see? You will have plenty time to put your child “first” later in their life.
You obviously don't have a 2.5 year old... lol
They do remember these trips and, for what it's worth, no toddler is going to put up with more than 10 minutes in a pram at the Louvre or Notre Dame before wanting to run around and play.