$10 polyester tarp from Yukon
Those simple $10 polyester diamond shaped tarps from Yukon outfitters are reasonably good. Many people trying to go light weight prefer Silicon treated nylon (SilNylon) or Cuben Fiber but 190T polyester with polyurethane coating can actually hold up better to sunlight (UV), so may be worth the weigh penalty for such a small tarp. I also like the tarps that have grosgrain loops along the top or as side panel pull outs this allows you to run a cord thru them and suspend to nearby trees etc to reduce the rain puddles on it and increase the head space below.
From time to time you can find Yukon on sale at Woot dot com (sorry if that is spam) I have never purchase from that site but it is very popular with many camping people, most of their stuff is a little junky to me but everything I take camping gets trashed anyway so what the woot.
I recommend just cutting or finding on the ground some sticks or poles to hold up the corners and "Pitching" a tarp like this in "porch" mode, then only pull the corners down to the ground if it is going to rain hard or strong winds. Many YT videos showing this here is one, from a guy who sells very expensive tarps. minutes 5:30 to 6:30
http://youtu.be/UHuUmNOwBAw
One of my photos in comment above and other people's photos in previous comments showed porch mode tarps better, point is sticks or found poles make this easy to do if a nearby tree or shrub is not convenient, or use a trekking pole or canoe/kayak paddle etc.
I also have a "Free Standing" Tri-pod shelter from Abo that I replaced the fiberglass poles with aluminum to make it lighter and pack smaller but I rarely use, mostly just when on a sand bar/beach with no trees. These and Kelty shade maker versions etc are a pain to set up and pack and even with all aluminum poles or not do not fit in a small kayak.
