Discover the municipality of Oss by walking around in the region. You don't need to be really fit but do expect walks around 10km or more.
Why do I write everything in English? Although this group might have a local character, Meetup.com does not. I embrace both the local and the cosmopolitan spirit and English is perfect for this.
"I know a good route"! That's great! If you think you can guide a group of people through nature without getting lost, be my guest! I like to have some co-organisers!
I don't have a car Ask on the forum of the meetup if somebody can pick you up. I will pick you up whenever I can. But don't be late at the meeting point! Oss has 2 train stations. These and most other stations have self-service rental bicycles. So if you're not afraid to travel a bit by bicycle that might also be an option.