I enjoy recreational inline skating (a.k.a. "roller-blading"), especially
when visiting cities around the world. Very many large cities have organized,
weekly (though sometimes seasonal) skates. Just search the web to find when
and where, then pack your skates or
rent when you get there. It's a great way to see a lot at a quick pace while
also meeting the locals and other visiting skaters.
I've included some photos and notes on some of my skates below.
I always wear wrist guards and knee pads.
On night skates, be sure to wear lights.
I use a flashing clip-on red bike tail-lamp, a reflective/flashing arm band,
and sometimes a white head lamp - available where bike or outdoor accessories
are sold. Also, note that some well organized skates require participants
to wear helmets.
To pack my skating gear, I just use a large upright zippered Samsonite
suitcase with large skate-wheel type rollers. The skates in a shoulder
bag and equipment (including helmet) takes up about a third of the space,
and then I have room left for clothes for 5-7 days.