I can also mention Tatras Mountains.
If you are in Lake Morskie Oko, you are already in the High Tatras !
Do spend a few hours here. Beautiful sceneries, trees, forests. Floras & faunas. Just don't get lost. Make sure you take the correct routes.
If you have the time while in Poprad, please take a day to enter Poland, it's only about 1 hour by car or bus.
One place that one should go is Moskie Oko or Lake Moskie in the Tatras Mountain Range in south of Poland. We have to walk, or rather hike (but for disabled people, there would be a van to reach the lake on top of the mountain).
From Poprad, we can take the bus to Lysa Polana, the border between Slovakia & Poland but in Polish terratory....From here, we can take the bus (about every half an hour) to reach a big car park where there are coaches/buses, vans & from here we can start walking/hiking to reach the top of one of the mountains to see a stunning lake called Moskie Oko.
This lake is amazingly beautiful. It took me about 2 hours, roughly about 8 km, from the car park to reach the lake but it took me about 1 hour & a half going down back to the carpark.
The walking is not too tiring because we can see old folks, students, young people happily walking pass one another to reach the lake! The feeling is a happy one.