In a market of more than a thousand products, the skill is not searching, it is filtering. Six questions do most of the work.
Where does it actually go? Look for a place name, not a region. "Everglades" is not a location. Shark Valley, Ernest Coe, Miccosukee, Tamiami Trail, Convoy Point and Boca Chita are.
Is there hotel pickup, and from where? Miami's pickup zones are usually defined by area: South Beach, downtown and Brickell are commonly covered, and Coral Gables, Coconut Grove and the airport hotels frequently are not. A tour without pickup from your area costs you a rideshare each way.
How big is the group? Miami runs everything from eight-seat vans to fifty-seat coaches under similar titles. On a food tour or a mural walk the group size is the product.
Who is operating it? Many listings are resellers. That is fine, but it means the cancellation terms and the meeting point come from the operator, not the site, and the confirmation email is the document that matters.
What is the weather policy? Boat trips cancel in this city, particularly in summer and particularly in the afternoon. Book water activities early in your stay so a cancellation has somewhere to move to.
What is not included? Park fees, fuel surcharges, equipment, gratuities and lunch. In a market at this price level, a suspiciously cheap listing usually resolves at the dock.
One last piece of timing. Book boats and airboats for the morning. The wind builds through the day on Biscayne Bay, afternoon thunderstorms are a summer fixture, and the first departure is almost always the calmest, coolest and least crowded version of the same trip.