Log bicycle rides and make graphs and tables from the data

I have a D6 site with CCK and Views and I would like the following:

• Log the ride data, such as date, km's biked, avg./max. speed etc.
• GPX track
• Optionaly link it to other rides to group them

I stumbled uppon the http://drupal.org/project/travellog project, but it does'nt suit my needs. So I went ahead and tried to build it myself with CCK and Views.

In CCK I created a new type with all the necessairy fields, as described above. I also added a field to show GPX files using the http://drupal.org/project/trackfield module.

But one problem remains... how do I show the entered data in a graph (for instance a view over time of the average speed, or my total KM's biked per month) or a table (displaying all the rides in a month). The last one is probely pretty easy to build, but I cant' get the graph working.

Help is much apreaciated.