Carley Jacobson over at the Instructables staff sent over her latest project we think is perfect for a slightly upscale summer picnic in the (Golden Gate) park: the Suitcase Picnic Table with Speaker System. It's a pretty simple project to copy, requiring only minimal materials and construction skills. You'll need a spare suitcase, the older the better, and a set of small USB powered speakers…Minty Boost USB charger. The suitcase also holds a set of plates and table setting within, and converts from suitcase into a small table for two with a set of retractable legs.
Sourcing a vintage suitcase might be as simple as snooping around your parents/grandparent's attic or basement (ask before, of course). We also recommend Goodwill, especially in neighborhoods with a high senior population, and checking out your local flea market.Altec Lansing BXR1220, but the newer Altec Lansing Orbit USB Stereo Speakers might be even better, since they're an upgrade in performance and of similar shape/size..
Complete instructions about Carley's project over at Instructables/Suitcase Picnic Table and Speaker System.
If you're not in the DIY mood, you can always just order a similar styled suitcase-audio creation, sans table legs from an Illinois artist who specializes in the luggage meets audio equipment category: