Use a guide for one dense day, a food or craft focus, a complex transfer, or an area where you want questions answered in context.
Ask about the day, not only credentials
Confirm the pace, meeting point, inclusions, language, accessibility, cancellation terms, and how the guide adapts to weather or energy levels.
Leave space for conversation
A guide-led day works best when the schedule is not packed beyond speaking, observing, and changing direction when something interesting appears.