Walking around the Aussenalster was one of the most pleasant things I did. Sailboats, rowboats, windsurfers & big ships all compete on the water, very exciting! Parks & footpaths all around, lined with cafés & marinas.
The best is to take a boat ride to Winterhude & take in the scenery. If you choose to walk back, don't miss Leinpfadstrasse with all its gorgeous villas. I read that there are boat rides along the Alsterfleet (locks canal) to the Elbe River but didn't see that.
A tour of the harbour is a must. It's called Hafenrundfahrt & you take the boat by the Rickmer Rickmers museum ship at Landungsbrücken.
If you're like me & enjoy even a ferry ride, you'll be in seventh heaven in Hamburg!
The pic is a monument to those who fell during the First world war. I found it stark and moving.

