This paper proposes a mobility system serving as an innovative platform that synchronises a ridesharing model and an Activity Travel Pattern (ATP) generator, enabling a synergistic enhancement of participants’ mobility experiences. Through system-level integration, it can significantly improve the performance of ridesharing systems while also exploring the intricate relationship between ridesharing and participants’ ATPs. Numerical examples demonstrate the advantages of ridesharing systems when armed with flexible/variable announcements from the ATPs-based participants. The results show that incorporating ATP-based announcements in the system increases the chances of finding a match, and the attractiveness of the ridesharing mode for participants is improved. Despite their lower number, ATP-based participants contribute significantly to finding matches and obtaining distance savings. The study also highlights the key role of tour gyration in the performance of the ridesharing system. It incentivises participants with distant activity locations to join the ridesharing system as ATP-based participants.