What was that old TV show ?!?

When I was young, there was a tv show about a club of kid detectives. Their "office" was a backyard club house and I seem to remember the leader was a boy with glasses and a boat captain's hat. The only episode I remember well is one where they tracked a bad guy to a closed amusement park. I believe it came on Sunday mornings. This would have been around late 70's or 80's. (This is not the Bloodhound Gang.) Can anyone remember the name of this show?

Update:

Thanks, but not Huck Finn/Tom Sawyer or Encyclopedia Brown. This was modern day for the year is was on. The club was made up of several pre-teens.

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