What would you recommend doing around Mission Beach, Queensland?

I'm new to actually participating in the forums on Lonely Planet but have been using them for years when I research places to go.

The wife and I will be at Mission Beach for three days at the end of a two-week vacation through Queensland. By then we will have already spent days at Cape Trib, some at Port Douglas, Mossman Gorge, Daintree, Chillagoe and Tablelands.

By then we will have already snorkeled the reef twice, done a helicopter tour, hiked, explored caves, balooned, visited waterfalls, beach walked and just some general tourist hanging out.

I want to do the one day Xtreme Tully white water rafting on one of the three remaining days when we are at Mission Beach but any suggestions for the other two days? We don't dive (sky or water) so those are out. We don't fish and we're not much into sailing but other than that we're pretty open to adventures or laid back depending on what could be interesting.

On our last day we'll have the entire day to travel up from Mission Beach back to Cairns so we're planning on catching some things to do between the two locations.

Any suggestions would be appreciated.