If addressed to someone contemplating a trip to the Grand Canyon, this seems fine (actually, I would say "in the Grand Canyon", but I'm not sure if this is a UK/personal thing). " If "you" means "people in general", and the sense is "Standing on the observation deck has the effect of making people feel like a bird in the sky", then "would" is to me unnecessary.
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New2grammar1. Is the sentence correct?Yes. Yes. will also works, as well as may, might, the past tense, and no modal at all.
2. Is 'would' used correctly?