You have to realize that there is a phenomenal limitation to this projector...
Brightness
If you use this projector entirely in the dark - a truly black night - then you can get maybe a 60" diagonal.
You aren't getting HD from the projector, and you must position the projector exactly for your screen size you want as it has no zoom.
LG has upped their game a bit with the HX300G (
http://www.projectorcentral.com/LG-HX300G.htm) which is a 300 lumen version of their LED projector and has XGA resolution instead of VGA. So, 50% more light output and 100% more resolution - those are some nice additions.
Yet, still - 300 lumens.
You may want to consider, in an outdoor environment, that is less than critical, the new Casio hybrid projectors...
http://www.projectorcentral.com/projectors.cfm?g=1&hide=1&st=1&lng=1&mfg=Casio&p=&w=&r=&br=&ll=&t=&db=&dt=&c=&ar=Wide+(16:9-10)&dvi=&td=&i=d&is=&sort=date
Now you are able to get TEN TIMES the brightness of the LG 201, and a widescreen HD projector to boot. They have HDMI inputs on them and while they are a bit noisy, the outdoor environement will help to disappate noise.
Remember: You may NOT leave a projector outdoors under any circumstances. It's like leaving a computer outside. The heat, cool, and most of all humidity will kill any piece of electronics very quickly. You must bring it inside or build a proper environmental enclosure for it. Simply covering it is not the same as an environmental enclosure.