You're on vacation!!!!!!!!!!!
On the packing.
1. Swimsuits do NOT take up much room and at least one needs to dry out so at a minimum you need 2.
2. System. I am quite sure this will surprise no one but...I make a spreadsheet listing all the tops, bottoms and shoes and then do a trial run on the packing an list them by outfit so I can see how many combo's I have and test what really goes with what. Having done that ahead of time it's easy on the trip to remember what I liked with what. It's also easy for me to cut things out as I can see the sheer numbers on paper and realize I'm being ridiculous.
I am one of those people that fully unpacks in a room so how I put it in the suitcase doesn't matter as much in terms of knowing what goes with what but the prep ahead of time really helps. I only over packed in 2 areas this trip, t shirts (too hot, wore sleeveless tops, could have skipped t's entirely and I knew it but brought them anyway) and shoes ( I wore them all but could have brought a few less) although I confess to bringing 3 suits and only wearing 2.
Because it's a spreadhseet I can then use it for the next trip. If it's at the same time of year.