I think it is all relative relative to your species, your family, your god, your peers, society, the environment....What is good for one is not always good for another so there are compromises.
In relation to me: I think a good person does not put ideology and religion before basic humanity (treat others like you want to be treated - unless it is a giver receiver arrangement where a person is happy doing the whipping and other is happy being whipped), to do things with consideration to striving for the least harm in their actions while balancing this with pressures of their own existence and the existence of others. I think you can only be as good as your context allows. A good person can forgive themselves and others, and learn from any wrong doing - whatever that may be.
