I rented a car to go there from Kaliningrad. It was February (not the best season to explore the Split, I'd say). The day was damn blowy and gusty winds at the beach literally got inside me notwithstanding my anorak. The sea was covered with hypnotizing rip curls and formidable waves were hitting the shore and even crushing some trekking paths (I saw quite a few in shambles).
Still, I spent a gorgeous day there. Breathtaking panoramas, pristine nature, no tourists and some cozy places to hide from inclement weather.
I had lunch at the excellent Rybniy Dvor/Fischhoff restaurant in Rybachiy (see my separate review), did some shopping at an amber shop near it, crisscrossed the Split as much as I could and finally, in complete darkness, stumbled upon a fox (not sure which of us got frightened more).
Entrance fee is ridiculously low (less than USD 6 including a car) but you must bear in mind that it's a natural park with pretty strict rules - parking only in allocated places, no camping, no deviation from marked paths, etc. And the authorities mean it: fines are significant.
A must see! Try to choose better weather though but avoid the high season - too crowdy.