We are from Hawaii too
When we went 2 Junes ago, at night I had my DD2 in jeans, usually a tshirt, under a long sleeve tshirt, then a children's place jacket (as you know, we can't find thicker stuff here so I tried to make do), now that was in June, so I think just be prepared to layer and you can take on or off as needed in the evenings. 9 years ago we went when my nephew was 3 at Thanksgiving and I remember him wearing jeans with long sleeve tshirt in the day, and we layered him at night. It is a cold we are not used too, not as cold as San Fran area feeling, but it is still pretty cold for us Hawaii folks, who pull out the double blankets when we get in the low 70's, high 60's right

LOL
We are staying at GCH too in Nov. (if DH gets off of work, his boss his changing his mind)
as for gloves, we bought DD3 gloves at the ice palace for like $3 or something, to best described them would be like a sweater, medium thickness, haha, sorry. I saw gloves for ladies at target a couple weeks ago, as well as at Kaneohe Ross's, and both places were cheap.
Have fun!! 11 days at the GCH, I'm so jealous!!!!