You can stroll along Karlskrona Trade Port for relaxing water views when you're in Trossö. If you carry on walking you'll get to Karlskrona Aspöfärjan Ferry Terminal, Stumholmen Sea Bath, and Fisktorget Ferry Terminal for some more water views.
You can spend time studying the exhibits at Naval Museum during your trip to Galgamarken-Trossö. Stroll along the marina or experience the area's museums.