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A variety of positive psychology intervention (PPI) activities can increase subjective well‐being. Still, there is variability in the impact of various PPI activities across people. In two studies, we examine strategies for personalizing a program of PPI activities to efficiently increase subjective well‐being. In Study 1 (N = 516), we examined participants' beliefs about and employment of various PPI activity selection strategies. Participants favored self‐selection over weakness‐based, strength‐based, or random activity assignments. When making activity selections for themselves, they reported using the weakness‐based strategy the most. The tendency to make weakness‐based activity selections related to negative affect whereas strengths‐based activity selections related to positive affect. In Study 2 (N = 112), we randomly assigned participants to complete a set of five PPI activities allocated either randomly, based on …