We used (later purchased) a large Minotaur Maze several years ago at The Science Place, Dallas. Great kid-friendly attraction, has ability to customize with educational messages, and can be used inside or outside.
Fairly easy to assemble, disassemble and move/change up for frequent visitors. One caution: kids like to RACE through, so contour it accordingly, and consider posting folks to urge a "slow down" during peak periods.
Liz Bleiberg