This park is wonderful if you want to run in a very scenic and pretty area but don't want to deal with running up steep hills. Highland Park has a few reservoirs where you can run around them and the surface is completely flat. However, if you want a hillier run, there are trails in the park where you will get a good hill workout!
Additionally, there is a pretty cool zoo and aquarium nearby and the park has a public pool and beach volleyball courts. I recommend making a visit!