Social emotional learning (SEL) is seen as critical for children's lifelong success. Though most of the research on preschoolers' SEL focuses on school-based interventions, children's museums are valuable resources for fostering SEL. This study compared observations of preschoolers' peer relationship skills in three different types of children's museum exhibits to identify practical design implications. We observed 1179 preschoolers at 12 children's museums across three exhibit types: (i) loose parts exhibits; (ii) scenario-based exhibits; and (iii) collaborative activity exhibits. We used the Revised/Shortened Minnesota Preschool Affect Checklist (MPAC-R/S) to observe and document peer relationships skills. Results suggest that these skills vary according to exhibit type, with preschoolers engaging in more joining, cooperating, and listening behaviors in loose parts and collaborative activity exhibits than in scenario-based exhibits. Study findings provide insight into factors that might promote or inhibit preschoolers' peer relationship skills in children's museum exhibits.