Wait until you get home to do the laundry. It's much less stressful. It's my vacation I'm not doing laundry.
We're a family of 5. When we got to FL in a year for our cruise we'll probably spend 2 weeks on vacation (one week of that being the cruise). There is no way on earth I can pack enough clothes for 14 days for the 5 of us (dh and i can rewear clothes and save space, but the kids get everything dirty! I'd probably have to pack at least 50 outfits to not do laundry). Also, we don't want to have to haul around that much stuff.
When we went to Japan, for 3 1/2 weeks, well, doing laundry was unavoidable. We went with 6 outfits for the kids, and 4 for dh and I. I did laundry every day to every other day. Fun, no, but necessary, yes. We were using public transit and there is no way I was going to haul more luggage then necessary on the trains!
Point being, laundry on a vacation of over a week is completely unavoidable. I will be doing laundry in FL or on the cruise. It's life. I even do laundry when we go to DL (on our off day usually). I'll have to price the laundry service on the cruise, but I think someone said $2 per item. So if it's that much and I need shorts and shirts washed for each of us that's going to be $20, for one outfit each! Yikes! Not to mention things like undies and socks.
So yes, in an ideal world, no laundry on vacation, but that's not always realistic.
And as one who does laundry on vacation, those who are polite when doing their laundry and don't clog up the machines are much appreciated!