There are lots of things to say when something doesn't go your way, but "Aw, nuts!" is one of the more family friendly. This one shouldn't have you saying anything of the sort though, as its purpose is less to challenge than to bring you to a fun spot, near a good trail for walking or riding on a nice day. There are even wild grapes growing along the trail! Plenty of other great caches are in the area too, so make a day of it!
Some risk of muggles, though a stealthy retrieval and replacement should be fairly easy. Please replace it as you find it.