I really enjoyed the MTB route at the Sallandse Heuvelrug National Park around Hellendoorn & Nijverdal. You can do different trails or combine the trails.
It can be busy in the weekend so if you like a bit more rest go during the week. But if you love to cycle I really recommend you to explore this area and MTB route in The Netherlands.
You can find more information here:https://www.visithellendoorn.com/Mountainbiking/