We broke out the slip n slide on July 4th...I had forgotten how fun it was!  If you are a grown woman or man and you attempt to slip n' slide please note the following:  If you do the feet first on your side slide...it hurts.  I highly recommend the head first tummy slide...even if you are well-endowed, but you might slide right off of the end unless you have a cool one like we do with a little blow up thing at the end.
Slip 'N slide Wave Rider
My kids are not into speedo's or anything, we were just lazy and stripped down to the undies without going in to find our swimsuits.

I found it on Amazon, but I also found some bigger and better ones. 
Can you imagine having two slip n' slides going at one time?  You could have races and all kinds of fun!  I have never tried a double slip n' slide, but if you have bigger kids or if one of your kids was having a summer party I would suggest checking out the double slide.
Wham-O Slip ‘N Slide Double Wave Rider

The giant ball sprinkler is also a bunch of fun.  We played in that at their grandmother's house the past few years.  Lots of fun for lots of kids.




So, don't let the heat keep you couped up inside.  Take em out and join in the fun if you dare or just soak up some sun (with sunscreen of course!)