Question about after school jobs for teachers:?

Greetings: Last year, I was the coordinator for an after school program for high school students. At this time, I received $25 an hour for three days a week(two hours per day). This year, I was asked to consider the position. I complied. I also made all of the preparations for the program with the umption that I would make the same thing. I received an at-will contract today for $1000.00 to do the program. This is an extremely inadequate monetary proposal and I don't want to do the job because the salary is a lot less. What should I do? If I write a decline letter for this contract, what do I need to write.