One of your first stops should be Thames Barrier information Center. Here, you'll be able to find your bearings and pick up some great ideas before you begin exploring.
If you're planning to stick around a while in Greenwich, Thames Barrier information Center is a fine place to kick off your sightseeing. This tourist information center is one of many attractions that'll keep you on the go here. Tower of London, St. Paul's Cathedral, and London Stadium are also waiting for you nearby.