How often do you have to swim in the job?
Depends on your venue. I had to prove I could get myself to the edge of the pool and get out of the water on my own. I will also add that I'm not a good swimmer, doggy paddle is perfectly acceptable. Some venues don't require a swim test, but that is one of the questions on the application.
What are SEA grooming standards? No visible tattoos? No more piercings than just one in each ear?
No visible (obscene) tattoos, no gauges, one piercing in each ear is fine, i don't think men are allowed earrings, one ring per hand (exception is a wedding band and engagement ring), men are clean shaven unless they are hired with facial hair, men can not have excessively long hair, wearing the uniform as designed, black or white shoes with matching socks.
Will they take someone from the UK? Please?
You'd have to have the proper paperwork to legally work in the United States, but to answer your question, yes! But, they do not provide moving expenses to relocate.
Seasonal: You work 10 months out of the calendar year. So that means you will be laid off two months out of the year, and they will not be two consecutive months. Chances are good though that your lay off months will be in the early part of the year.
Good questions!