Rather than struggle to find level ground on which to balance your drink, take along The Pampered Chef's Outdoor Party Sticks.
This set of wire cup and bottle holders eliminates the need for picnic ground balancing acts.
Just push a stick into the ground and place your drink (cup, can or bottle) into the wire ringed holder at the top. Each set comes with six cup holders and a bottle holder (large enough for wine, Champagne and 2-liter bottles).
If you favor wine al fresco, try WineStem Co.'s Wine Stems, which are a more decorative version of Pampered Chef's product designed specifically for wine glasses.