Check out Gothal, one of the region's most famous hotels. Stay a night or two or simply take a look around.
You'll be spoiled for sightseeing choice when visiting Liptovská Osada. Gothal is a good place to start here, but there are plenty of other worthy spots to visit. Donovaly Snow Park, Donovalkovo, and Brankovský Waterfall are not far from the place to stay and will fill in your day nicely.