i went last year at that time and loved it... mid 80's and I think we had 1 day with a passing shower. gorgeous weather!
I'll be there 5/3 to 5/8 and have gone that week twice before. The last two times I went that week it was unseasonably hot with temps in the mid to upper 90s. So if it is in the mid 80s, I'll be pleasantly surprised.
I am not packing any pants, but I'll wear jeans on the plane (I can't wear shorts on an airplane) and that will be my one pair of long pants. I'll also bring one maxi dress if I want to wear it at night -- as we do plan to take afternoon breaks at the pool at our resort.