This is a beautiful trip down the river Aare, begining at Biel/Bienne and ending in Solothurn.
Passing through a sluice, its apparently one of Switzerlands most scenic rides.
Good for kids (who like boats). Possibly better for those that are at least 2 or 3.
Arriving in Solothurn, you can also wander the streets and see
St Urs Cathedral, built between 1762 and 1773.
And a most beautiful Jesuit Church.
http://www.solothurn-city.ch/topic12124.html
There is not a lot of walking involved, so good for those whose legs are not so able.