If you've got the inclination - and space - you can rent large inflatable play structures from USA Inflatables, including free delivery and set-up in the metro area.
Options include obstacle courses, moonwalks, giant wet or dry slides, golf simulators...even inflatable climbing walls. Most equipment accommodates four to eight kids at a time, and parents can get in (or on) too.
Figure you'll need a flat obstruction-free area at least 20' x 20' for set-up of a single structure (check the website for specific sizes). Rent more than one and get a discount. USA will also provide an attendant ($20/hour; four-hour minimum) upon request.
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