Rachel seems to really like climbing around rather than staying firmly on the ground and in this scene we see her scrambling up on to a ruined structire in a Prague park and taking a long, arcing pee down on to the ground.
As is obvious by her figure, Rachel puts a lot of effort into keeping fit and trim and frequently goes out jogging or cycling. In this scene we see Rachel stop for a pee break just off the pathway. A passing cyclist was probably surprised at what he saw as he passed on the pathway.