We took the Thames Clipper from Greenwich to Westminster. (30 minutes)
Then we got on a slower boat to Hampton Court. It was a 3.5 hour ride up the river. Passed Chiswick, Kew, Richmond and beyond! The views were great, and our boat driver did some tourguide ish stuff and told us about the sites along the way.
Below is the boat we rode on. We sat on the front deck chairs. It is also a beautiful and warm day.