In this paper, we analyzed the effect of the number of creators and their conversations on making a tourist map as re-evaluating a familiar place. It means we try to study about collaborative decision making when mapping new places. We conducted experiments to make tourist maps where the participants described the tourist attractions as they actually walked in a familiar place. We compared three types of maps: (a) made by a single participant, (b) made by two participants without any conversations, and (c) with conversations. It was found that maps made by two participants with conversations had a higher proportion of unrevealed tourist attractions but a lower amount of tourist attractions than other maps. For these results, it seemed that conversations might bring introducing unrevealed tourist attractions to the conversation partner. Meanwhile, those also might waste the thinking-up time about the tourist attractions.