What's your ultimate goal with getting your master's degree? That will help to decide your best steps...
If you want to stick with academia (i.e. move onto a PhD program after) then you will want to focus on theory and research. Maybe even some programming.
If you want to get a job in the industry as a structural engineer, then you're going to want to focus on DESIGN. Make sure you learn a lot about detailing, design, and such. You can still focus on some more academic aspects of design (like non-linear analysis, performance based design and such). But, don't forsake the "simple" stuff like CAD and Revit and drawings.
If you want to do something in-between (say get into structural engineering software) then you'd want to focus on somewhere in between the two.
Also, you'll probably find yourself leaning towards some specialty (steel, concrete, post tensioned, bridges). That's not a bad thing. But, if you want to get into regular design, try to make an effort to "fill in the gaps" that you didn't study... like masonry or wood.