Awesome! Hills are great for weight loss, even when walking.
There are a lot of 5Ks with obstacles. A lot of them are American Ninja themed and have lots of inflatable stuff. Spartan races are obstacle-based, there was one in AT&T Stadium not long ago.
Hell, I did a 5K Mud Run if mud's your thing. Those all take a lot longer though and you need grip and muscle strength in addition to running if you're wanting to "race." I'd also recommend gloves if they use wood obstacles, like in mud run I did. Most obstacle races are just fun runs though (except Spartans, which are contests I believe).



