The whole park is impressively green and well maintained. But the part with the tickets is pretty small and at the moment there's not a whole lot to see - the main square is undergoing some works. Besides that, there are two houses, one of which you can enter, but it contains just some photos, not really worth the long queue. I would recommend visiting it if you want to see as much as possible of Gaudi's works; otherwise is not much for the price. Also, the views of the city are great, but they can be seen from a nearby hill with three crosses as well.