This Anthropologie-esque space is simple and cheap to set up. This just has to made those good summer novels even better. The space could be enhanced at night by the addition of a floor lamp, candles, and/or white lights.
Vintage cot. Although I wouldn't recommend relying on one for a good night's sleep, a vintage cot is a fun accessory to set on the porch or deck. I recently got one myself and it's received a lot of attention! Add a few pillows and you've got a nice place for reading magazines or catching some afternoon Zs.