Check for brunch constantly, if one doesn't open up go to whereever they are taking reservations (it will be in the Navigator) straightaway.
DD and I did a Spring Break together and I had only a few rules -
(1) don't be stupid (yes this is vague but she knew it encompassed going into other staterooms, smoking, drinking, etc)
(2) let me know where you're headed when you leave the stateroom (things could change but I had an idea at least)
(3) get up before 11 so the stateroom host could do his job (somedays this didn't happen, but close..)
(4) check in with me at dinner so I know what your plans are (to her credit, due to our odd tablemates, she ate dinner with me every night)
Rules in place, she and I had a great cruise. I went to the gym, ran on deck 4, had a healthy breakfast and lunch (usually alone), read on the verandah or spent time at the adult pool. We did a couple of excursions together and "crafts" and a couple of game shows. I believe there are sometimes activities for singles sailing but I was too happy doing a lot of nothing to parktake.
I agree with looking at the cruise meets thread.
Have a great trip!