The local bus transportation is available 0-24 between Novalja and Zrce Beach, which you can use anytime between the apartments and party places!
We would definitely recommend you to buy a bus pass for the local transportation, which you can travel unlimited with between your apartment and Zrce Beach.
The parking in Zrce Beach is not free of charge, but after the Jumbo cocktails, you are not going to be able to drive anyways.
The 6-day pass costs 30 EUR which you will get in an armband form for the week.
You can find the bus stops maps HERE.