Purpose - The purpose of this paper is to provide a deeper understanding of the relevance of shore excursions in the distribution of cruise passenger flows; an approach which has been overlooked by many studies on cruise tourism. Specifically, the paper focuses on two destinations: Barcelona, a mature cruise destination suffering from the impact of overcrowding; and Valencia, an emerging cruise destination facing the risk of future (similar) impacts. Design/methodology/approach - The method used is multiple-case study with replication logic. First, web content analysis is conducted of shore excursion descriptions of the destinations selected so as to identify the itineraries, as well as the municipalities and the specific tourist attractions included in the tours. Then, word-processing tools are used to create a regional and local data set to arrange the narrative data. Finally, density maps are drawn in order to examine the different visitor flows within the tourist hinterlands from the supply perspective. Findings - The results indicate that most shore excursions are concentrated in the port cities. Comparing the two destinations, the paper argues that the redistribution within the cities is not equally balanced. Nevertheless, the results also reveal that the excursions offered by local shore tourism operators (TOs) in both destinations have contributed to the expansion of the cruise tourist hinterland over a wider regional area. Research limitations/implications - This paper evaluates the visitor flow distribution from a supply perspective. Hence, future studies should examine the demand dimension in order to gain a deeper understanding of the concentration intensity. Additionally, it would be worth examining not only visitors taking guided tours but also the independent ones (those who visit the destination on their own). Originality/value - Despite the growing importance of cruise tourism, research on the role of local shore TOs in this sector is quite limited. One element that deserves more research attention is related to the role of shore excursions in the spatial configuration of the cruise tourist hinterland. Finally, the results obtained could also have significant implications for policy makers developing and promoting effective measures to prevent overcrowding.