When it gets warm enough each spring, I set up a folding table in a sunroom on the back of my house, and move my laptop along with a second monitor over there. The room has 5-foot-tall windows all the way around which I keep open. My screens are shaded from the sun, but otherwise it feels just the same as being outdoors all day. That's my home office until the fall, when I go back to using one of my spare bedrooms.
My portable office:
Noise canceling headphones(Linx Audio), Microsoft Arc Keyboard, Microsoft Arc Mouse, 22" AOC usb monitor (http://us.aoc.com/monitor_displays/e2251fwu) and my laptop, of course.
Rooted Android phone with Foxfi for tethering in case internet is unreliable.
Desk: Gerton/Finnvard
http://www.ikea.com/us/en/catalog/products/50106773/ http://www.ikea.com/us/en/catalog/products/00225293/