google hop on hop off paris somewhere around $20E
if you do we prefer late am or early afternoon since they run tkt ofr 24 hrs so you cna always go back to something next day

google paris bicycles and you can rent a bike for the day--hours or all day--pay for 2 hrs, leave it at the marked stands, see museum etc, come back get another or same bike--it's a major program in the city

get some hints from luxurylink.com--go to community section then EU then look up posts from contributor who lives ther half the year--she's a whiz at things to see/ do--one of her last posts was about the cemeteries in paris--jim morrison etc
her name is either LL_travelfan or LHBrown (old posts)