Just having fun with words….
Whatchamacallit: an object or person whose name one does not know or cannot recall.
This is a hike or bike series of caches placed near the sidewalk along Summerlin Road. This is not a park and grab. Please do not park on the side of the road. Numerous places are available nearby to park and get out and do a short hike or nice bike ride. No thorny vines or bushwhacking involved. The round-trip distance is approximately 4 miles from San Carlos Blvd west to the end of the sidewalk.
You are looking for a nano.