Well, the question is largely moot, seeing as 'good' is defined by one's ethical inclinations, which are a further reflection of one's morality, which forms based on one's values. Values are established by upbringing, environment, and opportunities...
So, when one ascends to a level of power so vast that they are described as a god, one's values change in a hurry. There is no static barometer to indicate whether you're being good or bad - unless one is a vassal to an even more powerful being and must act according to its inclinations.
Any act undertaken by a being of supreme moral authority is considered to be 'good' on the basis of its own moral mandate. After all, the actions it takes are justified in being for its own prosperity, and thus, the prosperity of those underneath it.
The more layman's approach would suggest playing nice, because that's what you had to do before. No, human beings are creatures of relevance-based behavior. Once a person skyrockets into the lofty echelon of ultimate beings, there are no peers to address such a condition other than any other possible Godlikes. So, the creature is then removed from the human condition and likely ceases to care about the welfare of its former commiserates - freeing itself from the good/bad moral dilemma.
Unless, of course, the ascendant chooses to live in the narrow-minded 'do-gooder' archetype, applying its abilities to a particular social microcosm, or (if sufficiently powerful) attempting something as asinine as world peace. If the latter is the case, then people would be compelled to cease combat and reconfigure their lives against their will; an act that by rights is considered to be authoritarian and 'bad' as it suppresses human nature and confines people - despite the greater good argument it likely incites. People, after all, choose to fight and see things their own way - castrating their wills is paramount to the wounding or destruction of their being.
So, what does this mean for me?
I would abandon the matrix of my prior knowledge, become embroiled in discovering whatever mysteries are open to me, dissipate and lose my sense of place, and likely be lost forever as a data sponge between dimensions, an unmeasurable mass of knowledge devoid of sentience or purpose. Not saying I would like it - it's just likely to happen.
