just launch it in terminal cruiser.sh or cruiser-gl.sh
for some reason i am not able to launch cruiser-gl.sh (maybe requires more powerful video card).
this is awesome application without need internet connection to function properly...
all you need is download the cruiser application, the country map you desire (mapsforge have the lite maps, openandromaps have more details), and the offline point of interests...
this is really cool and useful to plan your holidays...
the screenshot is only a reference (i only tested 2D maps)
the details you need to know is here:

http://wiki.openstreetmap.org/wiki/Cruiser