I was browsing for wood plans and found this bench. I would not use this exact design due to the rear legs. The designer seemed to want it not to tip over back. But threw away longevity. I may alter it by using a 2x6 for the rear legs to address the back tipping and make them vertical.
There was a kid's picnic table that I found that didn't look too bad.
Mostly it's fun just reading through them.