The end of October is absolutely sublime. It is our favorite time to go. The days are in the low to mid 80's and the nights in the high 60's - low 70's. I wear mainly shorts/capris & maybe a sweatshirt at night. It is mostly sunny, so bring sunscreen.
So, I pack mostly shorts/capris with one pair long pants, tanks & tees with one long sleeve & a sweatshirt,a pashmina, dining clothes, swimming stuff & sandals (no shoes on these piggies til it freezes)
I rarely carry a backpack anymore. When we head out in the evening that time of year, I usually carry a pashmina or a sweatshirt for when it cools off.
I highly suggest watching the weather pattern for the week before & the long term forecast to have a concrete idea, weather can always surprise you.