There are very good possibilities for walking and biking in the area (old farms and mansions in the neighbourhood).
From the summer house it is 5 km to Bathmen a lovely village with plenty of restaurants. Also there is an outdoor pool at 3 km distance.
Former Hanze cities as Zutphen (22 km) and Deventer (15 km) are easy to reach. A bit further Apeldoorn with the former Summer Palace of our royal family, national park Veluwe and Kroller Moller (Art) museum. Amsterdam is an hours drive.