We watched Wishes a few years ago from the Poly beach after eating dinner at Kona because we weren't going to make it in time. It was very nice and peaceful to sit on the beach and watch from a distance but you will not get the full effect of the music and you have a hard time hearing the dialogue. The speakers are few and far between and from our experience, hard to hear from unless you were sitting directly near one. This was hard to do though because several families had already camped out near them on the night we went. Still, it's beautiful to see - just don't get your hopes up to have the full effect as there is nothing like standing in the middle of Main Street and "being there" if you know what I mean.
HTH!