It has been many years since I've done this, so I can only give out generalities.
Try going to as many kinds of pages as you can: Wild garden, Playground, Compendium, your various gardens, etc. Even go to the Imprint page; I'm not sure if there's anything there, but it can't hurt to check.
Look around the page; in the scroll work around the edges of the page, as well as in the green area outside that. Move your mouse around slowly, if you're not sure if you see anything unusual. If it changes to a hand - or whatever you use for when something is clickable - click it. You may get a message that you need to click something else next, or that you need to click something else first.
The items need to be clicked in a certain order. Clicking on something that isn't next in line won't make you go back a step, it just won't advance you. But often an item will tell you that you need to click something else first, and then if you find that and click it, it will at least tell you if you have now advanced the story, or if there's yet another item you need to click before that one.
While I don't remember everything in this story - and I may be confusing some things with a Christmas story we had many years ago - items that come to mind are a honey pot, a spider, a fly, and two pieces of paper. But I could be wrong about the spider and the fly; they may have been from that other game that was also many years ago.