Tanya G: It's a beautiful place with great icecream shops and coffeehouses! Don't miss the small parallel streets. They kept a lot of the early Heidelberg spirit.
Danielle C.: This park is beautiful and provides lots of things to do. You could easily spend a whole day here. Entrance in spring and summer is 6€ (4€ for students) but that price is worth it.
Malte Evers: Take warm clothes and quite some time (approx 4h) with you! Most of the buildings are not heated, so it is a wee cold in there. The space exhibition is exceptional in Europe with real space stuff!