Maybe I should have been more specific. hehehe A proportional reward to the goal accomplished.
If I ride to work (22-24 miles r/t, 1500-1650' total climbing) then I get to have a handful of Cheetos with dinner. Yesterday I rode almost 81 miles with ~4900' of climbing and I drank a soda and ate deep dish pizza for dinner, but I didn't supplement that with a half a sack of Cheetos.
Inappropriate rewards will not work well: WooHoo! I rode to the grocery store. 2 mile r/t, 50' of climbing. I'm gonna eat a family size sack of crisps to celebrate!