When in Rome? How about when in New Orleans? The Hurricane powerful tropical drink will transport you to French Quarter during the first sip. Created in the 1940s, this super boozy rum-based concoction that will get the party started no matter where you are.
Passion fruit juice concentrate is widely available and can be bought for approx $10 a bottle on Amazon, which will make some 2 gallons of passion fruit juice. I freeze the concentrate into 1 oz cubes I can dilute in 7 oz water whenever it's time for a tropical drink...which in L.A. Is always.
If you're having trouble figuring out the simple syrup, you need to stick to Bartles and James.