If you're not happy with it, return it or you could probably sell it at a profit on Ebay since it's in such high demand.
Not sure why you don't think it was worth the money. I got the $24 Netflix credit so mine cost me only $11 but I would have been happy even without the credit.
Were you planning to use it on campground wifi? I doubt it would work well on campground wifi.
I've had one for awhile now and pretty happy with it. There are lots of developers that are lining up to make their apps work with it so once Google has the API stabilized there should be lots of apps appearing that can work with it. I believe it will surpass the capabilities of a Blu-Ray player or Roku in short order.
EDIT: Actually, the capabilities of the Chromecast already surpass those of a Roku or Blu-Ray player. Although there are currently only a handful of apps that support the Chromecast, anything that can be viewed in the Chrome browser can be "cast" to the TV. That means many video websites that can be brought up in the browser can be viewed on the TV. You can also "cast" your desktop so any file you can view on your desktop you can view on the TV including local video and picture files.