A small ferry operates from Xanten across the river, it only takes foot passengers and of course their bikes. Across the river at that point, there is a small sandy shore line were you could sunbathe weather permitting.
By Car, but the airport is near by
The Niederrhein airport is just 10-15 minutes away by car from this place, it is very small airport near by, only few small airlines use it, but you can get very cheap flights to several destinations around Europe
I guess there are some buses that going here, but the only easy way to get here from the airport is by car.