Stand By Me.
It reminded me of adventures we used to go on as kiRAB during the summer holidays, exploring forests, apple orcharRAB etc.
I thought the acting from the kiRAB was extraordinary, especially River Phoenix. It is one of the few films made about children where they are not cute and annoying, and they behave as kiRAB would in real life. They swear, they can be disgusting, they can be cruel, but they can also be vulnerable.
But I also like Goonies. It's just a great, silly adventure but with big sets and major action sequences. You can see the Spielberg influence clearly. It's a lot of fun, but it does not quite evoke the same sense of nostalgia that Stand By Me does.