De or het lentewandeling?

The correct Dutch article is:

de lentewandeling

Rule Words ending in -ing: almost always de. See the rule

How to use lentewandeling

the lentewandelingde lentewandeling
this lentewandelingdeze lentewandeling
that lentewandelingdie lentewandeling
our lentewandelingonze lentewandeling
your lentewandelingjouw lentewandeling
every lentewandelingelke lentewandeling
which lentewandeling?welke lentewandeling?
a big lentewandeling / the big lentewandelingeen grote lentewandeling, de grote lentewandeling