Crotatia

Here's an ideal itinerary for 3 days in Croatia, based on your constraints:

Day 1:

• Start your day with a leisurely breakfast at your hotel or Airbnb.
• Head to the beautiful city of Split, which is about an hour's drive from where you're staying.
• Spend the morning exploring the historic Diocletian's Palace, which is a UNESCO World Heritage Site and one of the most impressive Roman ruins in the world.
• After lunch, take a stroll along the Riva promenade, which offers stunning views of the Adriatic Sea.
• In the afternoon, drive to the nearby town of Trogir, which is another UNESCO World Heritage Site. Explore the charming old town, which is filled with narrow streets, ancient churches, and beautiful architecture.
• End your day with a relaxing swim at one of the nearby beaches.

Day 2:

• Today, head to the stunning Krka National Park, which is about an hour and a half's drive from where you're staying.
• Spend the day hiking through the park's lush forests and swimming in its crystal-clear waterfalls.
• Be sure to visit the Skradinski Buk waterfall, which is the largest and most famous waterfall in the park.
• After a full day of exploring, drive back to your accommodation and relax for the evening.

Day 3:

• Start your day with a scenic drive along the coast to the picturesque town of Omis.
• Take a walk along the Cetina River and admire the stunning views of the surrounding mountains.
• If you're feeling adventurous, you can go rafting or zip-lining in the area.
• After lunch, drive to the nearby town of Makarska and spend the afternoon lounging on the beach and soaking up the sun.
• In the evening, head back to your accommodation and enjoy a relaxing dinner.

Overall, this itinerary offers a perfect mix of history, nature, and relaxation, all at a relaxed pace. With your own car, you'll have the freedom to explore at your own pace and discover some of Croatia's hidden gems.