This is an idea for the most conservative and also does not involve too much effort and expense. Looking for wicker furniture or dark wood for a deck I would recommend using a sofa where they can get two or three people, and a small table. To decorate, you can find wicker pots or some other material to make us agree to land both for its color and texture.
If you've driven miles of miles to get to the field or just live there because you love nature, take it to your home! Have a bit of nature and green in your deck. Somehow, they end up mimicking the landscape making the space seem much larger. You can place a wooden bench as seen in the picture, if you want a comfortable sofa to give an afternoon nap.