I was very impressed with Hole-in-the-rock/Papago Park. Climbing up is fairly easy if you take the back way. It is a short hike, about 5-10 min. Going up the front is very steep. The park has several trails and picnic areas. I saw several little ground squirrels. There are so cute! It is also free to enter the park. The zoo is right next door so you could make a whole day out of the park and zoo. Parking is a little confusing though because there is very little signage. I just parked at the zoo and walked over.