Inspiration in Google Santa Tracker
Google's interactive Santa Tracker has lots of fun, course-like interactions that can provide inspiration. The hover interactions are fun, and there's just lot that happens as you roll your mouse pointer over items or click around. This also has the hidden slide-out menu on the left (I'm contemplating this for my current project, so this is another example I can look too.) You can enter the tracker from their home page. Here are some links to parts of it.
When click Track Santa and scroll down, there is a fun postcard rollover as well as games and videos:
This part has all kinds of activities: play, watch, learn. https://santatracker.google.com/village.html
Fun stuff! :-)