How can you not love the visualization of numbers? It to me is so important that students can not only make graphs, but actually read them. I don't think enough teachers & parents emphasize the reading and interpreting of graphs. Graphs tell a story and being able to interpret that story is such a wonderful skill. I just posted a lesson called Graphing Your Story that hopefully pushes students forward in this direction.
I'm also in the middle of working on a lesson request by one of my members who wanted a real-life lesson/activity based around collecting and modeling linear relationships (data that shows a constant rate of change) and I think I got something good cooking. It has another hands on activity, but will probably end up being the most logistically complicated activity - however if pulled off not only will you collect and model linear relationships, but compare them to nonlinear relationships as well. I'm pretty excited about it and think it will turn out pretty good. I just have to test it out before I post it live, but it should be done in a couple of weeks.
Both of these lessons showcase the importance of graphing, reading and interpreting graphs, and then predicting from them. A skill I enjoy and hope our students will as well.