The top 3 things to do in Kaunas:
1. Visit the street art gallery called Kiemo Galerija. It's not very known among tourists, but I got the advice from one of my local friends. The art was impressive and the neighborhood itself was really cool too!
2.Visit the park at the peninsula by the end of the old town, called Neries Ir Nemuno Santaka. It's nice to stroll around in the park in the evening and watch the sunset by the riverside. Afterwards you can have a beer in the old town nearby.
3. Have food and beers at the boulevard called Laisves alle. Here you find a huge sortiment of local craft beers, good wine and a nice selection of local food. All very cheap (if you're coming from Scandinavia).