The following are some suggestions from 350.Org for what we ourselves as the public can do:
Top Ideas For 10/10/10 Events
#1 Organize a Tree Planting
#2 Go Solar
#3 Work on a Community Garden or an Organic Farm
#4 Go For a Bike Ride
#5 Harness the Wind
#6 Get Efficient
#7 Do a trash cleanup
I went for a cycle to town today instead of taking my car.
"On 10/10/10 we'll show that we the people can do this--but we need bold energy policies from our political leaders to do it on a scale that truly matters. The goal of the day is not to solve the climate crisis one project at a time, but to send a pointed political message: if we can get to work, you can get to work too--on the legislation and the treaties that will make all our work easier in the long run." (taken from 350.Org)