Realistically, stopping time would also stop photons from traveling and you wouldn't be able to see shit... but then again I don't see how that could happen in reality anyways (if we were to live in a simulation, it might be possible though);

If it were to work like most fantasy scenarios treat it, then I'd use it to find out everything there is to find out (that we as humans already know). Stuff governments and rich people don't want the commonfolk to know anything about.

I'd use this power to indulge in all experiences that a human currently can be subjected to (nothing that would injure me though). Then I'd probably just kill myself...