Probably the best way to get a game like that is go to the editor, and generate a huge+ map, say 200 X 200 or larger, with the archipelago setting, with at least 16 possible civilizations, and then save the map as something like MyPeacefulGame. Then start the game up and hit the Contents button to load your new game. When the screen comes up to choose a civilization, make your choice, and the reduce the number of possible other civilizations to 4 to 6. By doing that, you achieve three
things. First, because of the large map and limited number of opponents, you have a lot longer time, normally, until you encounter the AI. Secondly, the map is set for 16 opponents, so you will have the strategic resources for 16, but will a lot fewer players, you will have a lower likelyhood of having to fight over resources. Lastly, since the AI civilizations are likely going to be on other land masses, they have a much harder time going to war with you. On a 362 X 362 map, the largest possible, you might not encounter the AI at all unless you go looking for the other civilizations. On a map like that, the Greeks or the Byzantines, both Scientific, would be good choices.