To work that may be permissable on Chol Hamoed :
- prevent a loss
- for needs of Moed
- for one who has no food
- for needs of the public
- if it does not require skilled labor.
See Mishna Berura 530.
For those who have vacation days coming to them , now is the time to schedule your time for Chol Hamoed.
Now may be a good time for a gem of Torah study.