Would either of these dresses be appropriate for a semi formal resort wedding?

I’m going to my first even destination wedding which is at a resort in Cabo San Lucas. The invite only mentioned semi formal and it’s a late afternoon wedding in the spring. I found these dresses online and I really like the black and white one, but I’m always hesitant to wear anything black or white to a wedding. This dress also comes in a green option which I like too. It does have a semi open back.

Thoughts on if either is tasteful enough for a beach/resort wedding?