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I always ask for the time or for sunscrean and I act like I forgot mine.
Sorry to disagree with you there but questions like "What time is it?" are pretty much LAME.
It's like:
YOU: What time is it?
HER: 09.45.
YOU: Okay.
Continuing a discussion from there makes it obvious for her that you are pushing it.
I'd go with the opinion openers anyways. They seem the most innocent, especially on a beach with half naked HB's everywhere. Just make sure you tell her from the beginning that you have to go soon.
Good luck!