Make sure to plan for lots of time spent at this park. We only had a day, and it wasn't nearly enough. We did the Angel's Landing hike early in the day. Unfortunately, we didn't have time to climb the last half mile, which is very steep (it has chains for you to pull yourself up). The chipmunks were definitely aggressive - keep an eye on your pack and don't set your sandwich down! In the afternoon we hiked The Narrows. We had rented gear in the morning, because the hike is literally up a river. Beautiful doesn't begin to cover it. Step carefully and make sure you have a walking stick. I recommend planning an entire day for each of these. Worth every minute.