Definitely worth buying a pass and going into the park, doing the various walks. Having plenty of water is essential with the heat.
The 'window' is very popular, and abit tricky to get to, having to walk down stairs, to a path, followed by making your own way over rock 'steps'.
We were fortunate that there were few people one we reached the part where you pick your way down and up the rock layers that are steps, as I would not want to be doing this with significant people trying to get to the window and others returning.
Good balance and a a lack of fear of heights is recommended, along with non slip shoes or sandals