Gia Dinh Park is a pleasant place to take a break. Have a picnic, wander around the grounds or just lie on the soft grass and close your eyes for a while.
You'll have no end of sightseeing choices when in Go Vap. Gia Dinh Park is a great place to start here, but there are lots of other interesting places to appreciate. Ben Thanh Market, Bui Vien Walking Street, and Saigon Square are not far from the recreation and green space and will round out your day nicely.