What is the largest planet I can get, while still remaining within Earth-like parameters? My concern is with gravity, water pressure and atmospheric pressure. Escape velocity is less of a concern. Available elements in areas accessible for human resource collection should be somewhat Earth-like, but the composition of the planets inside is less important, as long as it is plausible.
I would like to create a planet that is mostly covered in oceans, with optionally some small islands sticking out above the ocean's surface. I would like to see as large a volume of the ocean being accessible to a human-like culture as possible. So, basically the question is about maximizing the accessible ocean volume, on a planet where humans can reasonably comfortable survive.
These humans have a technology level we could think plausible for the year 2,200 or so (sci-fi, not sci-fantasy). These humans live in underwater settlements, towns and cities and travel between them is submarines.
While this is not a hard-science question, I would minimize the liberties that have to be taken, to get the largest, human inhabitable, ocean planet possible.