We were meant to stay in Split 3 nights instead we stayed 6.
By the end of that time I had had enough of sightseeing in Split so was ready to explore other places. Cue Krka National Park.
It was about a two hour drive from Split, and I did sleep most of the way (best cure for motion sickness!)
It cost 100kn for tickets into the park and when you get there you can buy extra excursions, like boat trips up the lakes. I would suggest getting there early if you want to do this though. They were all sold out by the time we got there and that was about 1pm.
We had planned to spend 2 hours there but after about an hour we had done most of the lakes you could get to for free. There was also a small village set up with a couple of restaurants and souvenir stores.