Start with what the visitor should do and what the interaction should help them understand. Touch can let a visitor choose content. Movement can become part of the experience. Sensors can provide the trigger for a response. The right approach depends on the audience, the story and the space available.
Interactive content has to fit the setting in which it will be used. A temporary exhibition and a permanent visitor centre have different operating needs. Include the expected visitor flow, interaction time, languages and installation duration in the brief, alongside the content you already have. These details help define the experience before design and production.