It all depends on a multitude of factors? What is the corpus of the account (ie. how much money do you have) and how much income are you trying to generate? What kind of risk are you willing to take? Do you want to leave anything to your heirs or consume it over the course of your life.
While I think most folks do not need financial advisors while they accumulate their investments, few people can do tax effective distributions like a financial advisor.
In general, rental real estate can generate quite a lot of income with the lowest cash outlay...but as you mentioned, it's work and can be a lot of work once it gets to be a certain size. I view rental properties more like a job or business than true passive income similar what a bond ladder throws off.
Bonds used to have a good stream of income associated with them, these days they pay very little to nothing. Broad stock indexes (S&P, VTSAX, etc) can throw off a nice dividend stream and give you long term growth, with some risk.
Annuities can fit some situations, but I strongly distrust most people who sell them since they'll think anyone breathing should have an annuity.
In simplest terms, you can generate about 4% in cash annually from your investments with some combo of stocks and bonds without oversized risks but there are just far too many complex variables for simple answers to your question.
A good financial advisor who is a fiduciary (not an insurance salesman, annuity salesman, or shill to a product line) will be your best bet for a holistic approach.