Take a Hot Air Balloon Ride over Trakai
If the weather allows, you should take a hot air balloon ride over Trakai in the early morning to see Trakai island castle and the lovely Lake Galve in all their splendor if you want a more memorable experience there. The hot air balloon tour usually goes for around 150 USD per person and it should take about 3 hours including transfers from and to Vilnius.
If you are lucky enough to be there on a foggy morning, you will be rewarded with a dreamy view of the Trakai island castle surrounded by mystical low clouds almost as if it came straight from a fairy tale. It is an incredible experience to have in Vilnius.