First, I have to be skeptical of the diagnosis of urinary tract infection. UTIs are rare in healthy males who don't have an anatomic urinary abnormality or recent urinary tract instrumentation (like a catheter when hospitalized). If you had negative tests for gonorrhea and chlamydia, and had a positive test for the sort of bacteria that cause UTI (like E. coli and others), then perhaps the diagnosis was correct. But it is more likely you had urethritis, i.e. an STD acquired either during your vacation exposure or from a prior sexual exposure. Clinicians who aren't especially familiar with STDs often make this mistake.
In the dose you took, ciprofloxacin would be effective against the likely STD. It isn't ideal against chlamydia, but in that dose probably would be effective. Your June 2 symptoms don't sound like urethritis, and the negative dipstick test is good evidence your infection had cleared up, whatever it was. I'm not sure what additional antibiotic you were given, but azithromycin is a good bet; the normal dose would be 4 pills, not 6, but the ER doc might have decided to use a large dose. It would cover chlamydia in the slight chance you had it and the cipro didn't work, and usually gonorrhea as well.
In any case, with the treatments you have had, you can be 100% certain you don't still have any bacterial STD. There is no particular reason for you to suspect herpes or other STDs in the absence of symptoms.
Next time, you'll probably have a condom-- right?
Good luck-- HHH, MD
HHH, MD