Cycling along the Danube between Passau and Vienna or even Budapest became quite popular within the last 15 years.
On both shores of the Danube and also of the river Inn you will mostly find seperate small streets ONLY for Bikers, without any car-trafic.
Only the first part of the Danube cyclers have to go on ordinary streets, all the rest they go on the ancient so-called "Treppelweg", where in medieval times horses were tearing the rafts upstream.
Equipment: In Passau you will find plenty of places, where you may rent a bike or biking-equipment.
One of them is the one with the funny name "Bike-clinic" - see my link below !
Various links to companies, where you may rent bikes in Passau
Ballooning is my dream since a very long time already and one day I will go for sure ! A saw a bunch of at least 10 balloons flying over Passau, while I was there last time in summer 2004.
Equipment: a flight of 1,5-2 hours is about 170 Euros ( and you even get a reduction of 10% with the Passau-card) children pay just 95 Euros.
For more details - click on their webpage below !
You may drive up to the castle or take one of the small buses,leaving at the old townhall or you may take a walk uphill on your own.
There are several small hicking-paths leading up the hill and within 20-30 minutes you will be at the castle, depending which path you take.
Along the way you will have plenty of great views on the city, and maybe you drive up by bus and take the walk down, like I did myself.
Equipment: No special hiking shoes are required, but walking in high heels is certainly not a good idea.
Especially in autumn the path might be slippery at some places.