Is anyone going to mention anything practical for a poverty boater with kids?
There is always the option of the pop up event style tents. Yeah, they are bulky but they can be found cheap and go up quick and easy. Some of them have attachable walls. Those light expensive tarps are great and all but they are not fun to set up on the beach if the weather is already unpleasant and you have kids to juggle. One person can easily set it up in the wind and rain. And they don't collapse on the kitchen if children running around trip over the guylines (good luck not swearing like my drunk grandmother when that happens). They may be big, but they are stress free if you have a 7 and 9 year old, are weather resilient and easy to move if the sun does (which I guarantee you it will as it always does). They aren't light and don't have the "cool gear" factor, but they are way more affordable (a NRS River Wing is $400) and are more practical if you are not on an ounce-counting adventure. Free standing is the way to go if you are setting up with kids.
for example there are hundreds of options under $100 like
https://www.walmart.com/ip/Best-Cho...ebo-Canopy-Shade-Tent-w-Adjustable-Height-Wind-Vent-Carrying-Bag-Blue/265252056
Another option that I have become fond of and would recommend if you care about bulk but still want the quick setup is the massive sportbrellas. They have guylines and are very wind resistant. If you want beach shade they provide complete cover for four people when on their side. And when the sun moves you can move them. Last year on Deso we spent a while setting up the fancy tarp shelter and the sun lowered half an hour later and it provided no shade to the seating/cooking area - we moved everything else because we didn't want to set it up again. If you need instant rain cover, like boating in monsoon season, they are the easiest. We got hit by a monsoon right as we set up the kitchen on the Grand last summer and our group had three of the same 9 foot sunbrellas (coincidence) and managed to create almost complete cover for the work station in minutes. And if you don't have a bimini then you should already have an umbrella stand on your boat and aren't giving up any space by using this option.
https://www.amazon.com/Sport-Brella-BRE01-XL-070-Parent-X-Large-Umbrella/dp/B01M9CHLXE
If you are determined to spend a frustrated 15 minutes setting up a non-freestanding tarp with a bunch of long poles, guy lines everywhere, and stakes that won't stay where you want them, while arguing with Santi and Chris about what angle the oars should be at and how far the lines should go out, there is always the option of the regular ol' big green truck tarps (the good ones). They are bomber, inexpensive, and the one I found in my garage (no idea where it came from) even has little corner pockets that fit oars perfectly. And the eyelets give so many options for tie out arrangements while those fancy pants tarps have pretty limited setup options. And you probably have one in your garage.
If you are a weight weeney or gear junkie ignore everything I said - I love my two pound MSR shelter but I feel like a monster when I tell my five year old I don't want her to help the adults set up shelter while thinking I could already be drinking a (2nd) beer if I had packed a pop up shelter. Also, you could buy all three of the things I suggested for less than the price of a Big Agnes Deep Creek Tarp (which as a gear junkie I do really want). The kids can help (and not be a nuisance) with options 1 and 2. As a river parent you have to get past the cool factor and be practical and budget conscious.
Full disclosure: I am an ounce counter and my backpacking setup tops off at 14 pounds. I got into rafting because sometimes I want the excess luxuries in the wilderness without being weight/space conscious.
If you read this post in its entirety, you will never be able to deal with struggling to set up an expensive ultralight tarp in the sand surrounded by kids without thinking about how nice it would be to have a free standing pop up arrangement.
So help me science, if anyone brings up "Made in China" sh!t I swear I will delete my mountainbuzz profile.