Suicidal ideation is a tricky one. It is annoying as heck to have and can greatly impact your life, but if you don't think you'll act on these thoughts then it may be better to not go inpatient because that's usually reserved for people who are an immediate danger to themselves/others.

That being said, my last admission was not due to being a danger to myself, but I had stopped all my meds and went to the hospital for a week long visit for a med adjustment. I was not suicidal (just thoughts), but it was a nice break.

I would choose number 2 but if you ever feel like you're going to legitimately act on these suicidal thoughts, then by all means go to the emergency room. Even suicidal ideation without intent is not easy to have but it doesn't necessarily require hospitalization. Regardless of what you decide, I hope you are feeling better soon.