Just because you're in the park (or at the beach, or in your own backyard), doesn't mean you shouldn't have a surface to work with. Like, say, this fully packable, portable wooden table. It comes in a carrying bag and sets up low to the ground — making it incredibly comfortable to use if you're picnicking on the grass. Plus, it's super easy to assemble; you should be able to build it up and break it down 2 minutes flat.
(L)27" x (W)27" x (H)16"
Pine wood with plastic feet
Tool-free assembly required (instructions included)
Table is designed to stretch to fit the slats snugly