Which sign would inform drivers about the availability of boat access at a location?

The boat ramp sign is specifically designed to indicate the presence of a boat access point. This sign communicates to drivers and boaters that there is a designated area for launching and retrieving boats, making it clear where they can access the water safely. Recognizing this type of signage is crucial for individuals who are planning activities related to boating or fishing, as it helps them locate appropriate points for their recreational endeavors.

In contrast, other signs such as camping signs, park entrance signs, and rest area signs serve different purposes. A camping sign directs individuals toward camping facilities, a park entrance sign indicates the entrance to a park, and a rest area sign provides information about locations where travelers can stop to rest and refresh. These signs do not convey information about boat access, which is why the boat ramp sign is the most relevant and informative choice regarding the availability of boat access at a location.