Meyer Park is a fairly large park that straddles both sides of Cypresswood Drive. It has paved walkways that meander around both sides of the park. This park is very busy so don't expect solitude. However, if you're looking to exercise and you don't walk to do it alone, there are plenty of people exercising at this park. One of the nicer parks in NW Houston.
At the far west end of Meyer Park on the south side of Cypresswood Drive, there is an unnamed nature trail that loops around through the woods. It is very short (approximately 1/3 mile).
At the east end of Meyer Park on the south side of Cypresswood Drive, you can catch the Gourley Nature Trail to Collins Park. You can read my log of that trail here.
At the south end of Meyer Park on the south side of Cypresswood Drive, you can also catch the Cypresswood Trails, a popular hike & bike trail that runs along Cypress Creek.