OPI Back to the Beach Peach is a bright corally pink/peach creme that has a smooth, glazed like finish. It is bright, but not garish, a very nice splash of summer color. I wouldn't call it a straight peach because it is really a blend of medium pink, peach and corals, it's not a straight color to describe.
Here it is under the sunlight, which picks up a lighter pink tone:
The finish is very smooth, applies reasonably opaque in 2 coats (if you apply two very thin coats you might see a tiny bit of nail tip)- but 3 coats will be a very rich luscious creme finish. There is no shimmers or glitters inside, just a very good creme in a smooth consistency, that is not prone to brushmarks, streaks or lines.
This picture under indoor flash picks up a more peachy tone, you can see how smooth and shiny the finish is (I have Revlon clear coat on top, but even without topcoat it is still a very shiny color)
Base of bottle:
Overall a thumbs up for this color. I've been wearing this to the office since it is right after Christmas break (summer in Sydney) and the office mood is pretty relaxed. Definitely not a color I'd be wearing to client meetings at any point though.