Thanks for the info - in that case, it's likely a Pubicalyx!
Interestingly, this is the ONLY Hoya I saw on Kauai that was not in a nursery and even there, only 1-2 varieties. I went thinking that I will see lots of Hoyas, given how ideal the climate is, but this was not the case.
I saw a lot of Stephanotis in front yards, but never a Hoya! I wonder why they aren't more popular. I'm sure my Hoyas would love to live in Hawaii!
Here's one monster H. cumingiana I saw at a nursery.
