Hello CyberFerret - I, too, question why you would want to get a tattoo on your vacation. It hurts first of all, and they, depending on the parlor, they cover it in plastic wrap or gauze which would be uncomfortable if you plan on going to the parks. You cannot submerge them in water - so no swimming or jacuzzis. You'll have to stop periodically to apply ointment to them. May I also add, it hurts up to a week after you get a tattoo - like a bad sunburn.
I don't know where you're from, but I'm from Minnesota - that's where I got my tattoo (live in FL now) and my tattoo (of Mickey Mouse) cost $65. I have checked several tattoo parlors here in Orlando and they are VERY VERY expensive. They wanted over $65 just to touch up the one I already have, and would charge $185 for a similar tattoo. In my opinion - get it done locally. It will probably be cheaper, and you will find most places will do free touch ups in the future. May I suggest getting it done 3 weeks before you leave for vacation so you can show it off - just make sure to put sunscreen on it.