If you are autistic go on vacation during offseason
I know it’s not off season for the US or Canada, but if you go on vacation to Europe around this time it is very quiet in most places. If you find children annoying and don’t like very busy places or resorts then go at this time.
I’m currently in Portugal and the resort I am staying at is 99% old people and probably retired people, and there are basically no children here, and you could always go to an adult only place but most places in Europe during their school time is basically all adult only anyway. Normally I am on vacation during peak season like Christmas, summer, or around April and a lot of places I have been to have just stressed me out and caused anxiety the entire time but now I feel more relaxed