Help????? Scooby-Doo lost book????????????

So, earlier in the year, I wanted to see a Scooby-Doo book that I came across back when I was 7 years old when I use to go to this Autistic School (because I'm Autistic), and I've tried to find it on every site possible (Amazon, Ebay (for listings), Youtube, Scholastic (the company I think published it, but I could be wrong)), and I still couldn't find it! So, I don't really remember much about the Scooby-Doo book, but what I can remember (and can only remember) is a scene at the beginning where the gang goes to Pelee Island and I believe has a picnic. I believe it was a Canadian-produced book (since I've lived in Canada all my life). I found many close leads, like this one where they had a picnic in the beginning, but it wasn't the scene I recognized. So, if any of y'all can help me find this, it would be a blessing!