I might go on a picnic this weekend
Me too and I always make sure to play some outdoor games when I picnic or some at least other form of entertainment, Its common for me to do this at large picnics. Do you also play and have fun at picnics? 
I think for us it would be romantic picnic. what food should i pack?
Well if your picnic is in the late mornings or midday id suggest bringing breakfasts items like muffins!, but could you can also bring friend chicken and potato salad if its near dinner time.
That sounds like a great i dea
When I usually go on romantic picnics, I bring a picnic basket and a blanket to sit om, But my girlfriend usually  brought along her own.
I might even bring a little wine
White wine
White wine is a wine that is fermented without skin contact. The colour can be straw-yellow, yellow-green, or yellow-gold. It is produced by the alcoholic fermentation of the non-coloured pulp of grapes, which may have a skin of any colour. White wine has existed for at least 2500 years.
The wide variety of white wines comes from the large number of varieties, methods of winemaking, and ratios of residual sugar. White wine is mainly from "white"
a combination of all of the above.
On romantic and family picnics, a picnic basket and a blanket (to sit or recline on) are usually brought along. Outdoor games or some other form of entertainment are common at large picnics. In established public parks, a picnic area generally includes picnic tables and possibly other items related to eating outdoors, such as built-in grills, water faucets, garbage containers, and restrooms.
Some picnics are a potluck, an entertainment at which each person contributed some dish