We got the €40 day pass in September. Note you can only buy your ticket from the office on the day .. they don't do tickets for other dates. We started early and got the 8am first boat to the Skradinski buk falls.  Glad we did as it was busy but nothing like what we saw on the other boats which were packed. A nice cruise along the River and then a little walk takes to you to a bridge with a beautiful view of the falls.  Early morning you could enjoy it.. come 10am.. it was too busy and not so enjoyable. The walk ways round the park are well maintained and the numerous falls are very impressive. Think charging to use the toilet after forking out €40 entrance is a bit bad. Signage explained the wildlife and fauna. Plenty of eating and drinking places and tourist shops. Got the 10.30 boat back which was a larger boat than we came in on and was quiet and spacious. We had our own hire car and drove to Roski Slap.. parking was a bit of a pain.. and in all honesty this area was quite disappointing. The falls are some distance away and the cave is small. Although there are 519 steps up we walked it rather than take the complimentary bus up.  There are some nice views to be had from here. For lunch recommend the Panorama Roski restaurant.. Great grilled Trout and an amazing view. We visited Krka Monastery which was very beautiful. The people working there were very helpful and informative and you can visit the crypt and church. Drove to Upper Krka and spotted off at the Roman ruins and Manojlovacki Slap which is just a short walk to the viewing point. We didn't walk down to the falls as didn't have time but they looked very impressive. Next stop circling the park was Vidikovac Brljan view point. Just a few moments needed here. Then onto Visovac viewpoint where there's also a monument to the Croatian King.  The view here was beautiful although the sun late afternoon is directly in front of you. Last stop was Cikola viewpoint where the colours late in the day made the view lovely. With light falling and the park closing that was it. Day 2 we didn't purchase a ticket for the park but did hire e-bikes from Riki Adventures which I 100% recommend. You can see the quieter areas of the park including more view points, a beach for swimming and we loved it. See my separate review under Rikis Adventures Skradin. Also recommend driving to Vidikovac Krnići Gornji at sunset.  There isn't much space for parking and there's a little 10 min walk to the viewpoint but the views and peacefulness is so nice.