Huge park on one side of The Eiffel Tower. The other side is the Seine and Trocadero. I don't think you will go to the park without The Eiffel Tower, they are kind of do both together. The RER train will take you to the Parc du Champ de Mars stop or subway or 69 bus from Rue de Rivoli. It, of course offers excellent views and pics of the Eiffel Tower in addition to being a relaxing spot after viewing. It is a large open area, so take caution during hot/cold weather. Wheelchair accessible. Did not see any public toilets.