Bridesmaid tan lines

I'm a very pale bridesmaid in my brother's Mexico DW. I will be there for a whole week before the actual wedding, swimming and in the sun daily. My bridesmaid dress is strapless. My swimsuits are not. What should I do about tan lines/burn lines? The ceremony and reception is very formal as I understand it but I honestly have no idea how to navigate this. There is an option to have my makeup done the day of, would a makeup person be able to take care of that? I was planning to do my own makeup, but if I do get some color on my skin, none of my makeup will match anyways. Thanks for any advice!