Hello and apologies for my stupidity and noobness.

I'm going to central Mexico next week (80-90 degree days, but forecast is rain and cool evenings). My wardrobe is 7" shorts (lots of orlebar bown and Lacoste), with polos and linen tops with tshirts, etc. I am trying to get ideas on casual poolside/barside sweater/hoodie/Jacket for the cool evenings. I have an LBM sport coat, to dress up, but wanted a casual option.

Any ideas?

Thank you!