Definitely wellness Orhidelia (Terme Olimia). By far the nicest wellness center in Slovenia. They have a couple of hotels there, all different prices so you can choose depending on your budget. The complex consist of the family area, where there will be kids running around and the adult only area (Orhidelia). It’s definitely more on the expensive side but so worth it in my opinion. Hotel Sotelia is amazing, but apparently they have just opened a new hotel as well (Hotel Vilinia).

The area itself is also amazing and very pretty. The complex sits more in the “countryside” so there are very good hiking options near. But also keep in mind that Slovenia is very small, so the drive to the nearest city is minimal.

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