Thank you. I don't have a clearer shot of those, it was taken from across a lagoon, so there's not going to be much detail. If it helps, here's the original photo, I flipped it left to right for the banner. The one on the right side (left side in the banner), might be a white spirea? Those arching stems remind me of spirea at least.
Edit to add that the photo was taken mid-May, in case that helps anyone with a better ID.