Croatia in May or September is as good as Europe gets. You get warm Adriatic water, open tables in Dubrovnik, and quiet ferry rides between islands like Hvar and Korčula without the summer crowds.
A solid two-week trip runs about $3,500 total. Instead of paying that all upfront, you can use the Citi Simplicity® Credit Card to split the cost into manageable monthly payments.
Keep in mind that 0% interest is a timeline, not free money. If you still have a balance after 18 months, regular interest applies to whatever remains, so stick to that $194.44 monthly target.