With the rapid development of science and technology, an era of intelligence has started in people’s lives, and intelligent robots, intelligent home systems, intelligent parking systems and other products of intelligent technologies have been quietly applied to all aspects of modern life. Experiential and interactive media landscape installations based on intelligent technologies have also been introduced into seaside parks in this context. Intelligent technologies are utilized to innovate traditional landscape installations, break the traditional limitations of thinking, and change the way of interaction between landscape installations and the public in seaside parks. Thus, the public can create an interesting connection with the landscape installations to enhance the participation and experience of the public. Emotion recognition, as an integral part of AI, has received more and more attention from experts and scholars at home and abroad. The landscape installations in domestic seaside parks are becoming more and more intelligent, and are customized to meet the needs of special target groups, such as the elderly. In this paper, the intelligent setting of landscape installations is investigated using multimodal interaction. First, it explains in detail the multimodal interaction, landscape installations, and intelligence. It innovatively combines experiential and interactive media landscape installations based on intelligent technologies with seaside city parks and analyzes and summarizes the cases in China and abroad. Furthermore, it explores how interactive media landscape installations work in different seaside parks, and examines how they are designed and technically implemented. At the same time, a plan is formulated to optimize the landscape installations for different groups of people in the seaside parks. Finally, the key points for optimizing the design of intelligent landscape installations for the elderly are proposed, and experiments are conducted to analyze how the design of multimodal interaction enhances the consumption perceptions of the elderly consumer groups. The experiment demonstrates the superiority of multimodal interaction for intelligent landscape installations.