Thanks for volunteering to class up this website by adding your opinion to it. Finally there'll be a reason to keep the Internet around! A few requests: please steer clear of politics and religion; please don't slander anyone; and please don't use any magic words that will cause this site to get blacklisted by web filters.
Otherwise, have at it. Remember, writing reviews for Yosemite Hikes not only makes the world a happier, better informed place, but it also improves your credit rating, gives you a glossy coat, and makes you irresistible to whichever gender you most enjoy being irresistible to.1 If you've done anything more important this year, you're probably reading this from the international space station while you wait for the Aldebaran envoy to return from the loo.
Please note that reviews are moderated by an actual humanlike person, so it might take a couple days for yours to make it to the website.
1) You acknowledge that you are assigning all rights to your review to the owners of this website to be used in any way. If said owners want to display your review on the website (the main idea, obviously), or publish it in a book or phone app, or beam it into outer space, or translate it into other languages, or sell the film rights, or disassemble it and sell the vowels, or anything else that you or anyone else can possibly think of, you hereby grant that right and will not receive any compensation and probably not even any gratitude (thanks in advance, though!). If your review wins the Nobel Prize for Yosemite Hiking Trail Reviews, this website will take all the credit and any accompanying enormous cash prizes and you're OK with that.
2) You assert that you actually own all the rights that you're assigning to the owners of this website in the previous paragraph. Or that you owned them up until the moment you assigned them to said owners, at any rate. This means, basically, that you wrote it yourself and you haven't published any of it anywhere else and you won't subsequently publish it anywhere else that will result in your assigning any of the rights to any other party.
3) You acknowledge that your review will not include any statements that will libel or defame any parties and result in nasty letters being sent, lawsuits being filed, etc., and if it does, you take full responsibility for your statements. (It's nearly impossible to libel a hiking trail, so this shouldn't be too hard for you.) You also acknowledge that your review does not contain any dangerous or misleading advice that will cause harm to readers of it (don't advise anyone to jump off cliffs, for instance), and if it does, you again take full responsibility for your statements.
4) You acknowledge that you are awesome.