Croatia is best when the crowds thin out in May or September, leaving you with empty cobblestone streets in Split and clear water in Hvar. The weather stays warm enough for swimming, but the prices drop significantly compared to the peak summer rush.
You can manage the $3200 cost for a standard trip by spreading it over a longer window using the Citi Simplicity® Credit Card. It offers 0% for 18 months on purchases and balance transfers from date of account opening, which makes your travel expenses much easier to handle.
Remember that the 0% period is a deadline, not a gift. If you have a balance left on the card after the 18 months are up, you will start paying interest on the remaining amount.