Keep off the grass. Sand is banned. And mud is dud.As every picnic connoisseur knows, wriggling rug rats won’t park their behinds on anything less than pure quality when gobbling up a sand-filled sandwich.Serve your spread on a rug from The Atlantic Blanket Company and everyone will be happy. Founded by mother-of-three Jo Riley, the Cornwall-based company offers an unusually sophisticated array of throws in alpaca, cashmere, merino and mohair, and in a variety of groovy patterns and colours.They’re ideal for seaside jaunts, school sports days, car journeys, or communal cuddles on the sofa. (The extra-snuggly range for Baby’s nursery is also worth a peek.)Come summertime, they’re all you need to lay on.Available online at atlanticblankets.com.DRINKLittle People’s TeaWhat: New caffeine-free strawberry blend for mini slurpers.Why: Sip, sip hooray.When: Breakfast, tea and supper.Where: The Grocer on Elgin, 6 Elgin Cres., W11 2HX (020 7221 3844); Whole Foods, 63-97 Kensington High St., W8 5SE (020 7368 4500); online at mycupoft.co.uk.SEEThe Great Museum MarathonWhat: Free drop-in show features a relay team from Museum of London performing the major historic events of the city from 1000 to 2009.Why: Someone’s telling tales.When: Sat., 10 a.m.-8:09 p.m.Where: Museum of London, London Wall, EC2Y 5HN (020 7001 9844).PERUSEFuture GardensWhat: New site just twenty mins from London has didactic creations, including Through the Flowerpot Garden, The Spangle Gall Garden and Theatre of Insects. Why: See how they grow.When: Opens Fri. Daily, 9:30 a.m.-6 p.m.Where: Future Gardens, Miriam Ln., off Noke Ln., Chiswell Green, Hertfordshire, AL2 3NY (01727 869203).