Good suggestions. Stranger Things is the closest to a modern day Goonies revival so don't miss that one. Season 2 later this year!
Stephen King's IT (1990) or the upcoming 2017 readaptation.
I'm glad someone mentioned The Explorers. I love the first like, 2/3, the last 1/3 doesn't stand up as much to rewatching. But definitely see it.
Flight of the Navigator?
I don't know what else to add. I'll say that Sleepers (1996) starts out kinda like a Stand By Me/Sandlot-esque film but then some really dark shit happens that TOTALLY changes it. So if you want to watch something fucked up, you can try that one maybe.