Without knowing anything about a bastion, I was able to appreciate the beautiful architecture, and stunning views this place has. There are a few restaurant/bars throughout the bastion which you can stop at if you like, but otherwise everyone is free to wander around and enjoy this magnificent place. It was a stunner day when we were up there, musicians were playing, the views were unrivalled, and the atmosphere very relaxed. Whilst you're up Castle Hill, there's plenty to do. Look out for the men doing falconry - one of them has a massive bird, and only asks 1800 HUF to have a go (well worth the photos opportunities).