Cleveland Ohio Camping

Try here first they will have or give you good info

https://lecbsa.org/

Closest I have found in my searches is Cleveland SE KOA, though we haven't tried it yet.
I did learn that the parking for the football stadium, which is walking distance to both the science center and the rock n roll HOF, will accept RV day and overnight parking for a fee. I doubt they will let you pitch tents in the parking lot though:)

might try getting a hold of a scout group in that area.

There is a dearth of campgrounds close to downtown.

We ended up in Geneva-on-the-Lake. Not close but do-able and it was very pleasant area. Old summer vacation destination with a throwback feel. Comfortable restaurants, mini golf, etc.

Geneva SP is nice as mentioned above. Findley SP is closer to downtown than Geneva SP, and has more campsites to choose from. I've never camped at Punderson SP, but that would also be a bit closer than Geneva SP. Here's an Ohio SP link below...

http://parks.ohiodnr.gov/

There is a RV park near Painesville too.
The parks we’ve stayed at in Geneva were private.

With Scouts in mind, I'd suggest Punderson State Park. There is a lake there, and you can rent row boats or even a pontoon boat. It's been 7 years or more since we were there, but I wouldn't mind going back.

Another option could be the Streetsboro KOA which has a nice area for tent camping. I would call them to see how they handle groups and if you could use the tent area that is closer to the office. Don't know how that would work with your RV. It's really nice and set off from the RV area. Travel time up to Rock & Roll will be about 30 minutes, but I'd suggest avoiding prime commuting hours as the 480 can be pretty hectic.

Another option is the American Wilderness Campground (https://americanwildernesscampground.com/) in Grafton. Again, about 30 minutes or so travel time to the Cleveland attractions.

Hope you have a great trip!

I think the city of Cleveland is missing out. I think a full hook up campground would bring folks to Cleveland and visit...also spend money.

We stayed at the streetsboro KOA. Would do it again in that area

Just throwing out there but there is a scout camp (Stigwandish) out in Madison, OH? It’s about 35 minutes East of Cleveland just off I-90. Around the corner (about 1.5 miles away) is a KOA (Madison-Thompson) that is pretty nice. It’s a little closer to Cleveland than Geneva on the Lake (Geneva State Park).

There are a couple Kenisee parks out a but further east in Austinburg and Jefferson.