Recreational Cum Learning Activities At Workplace?

I am the HR Manager in an IT company, I want to arrange some recreational activities for Saturday's (working days) in the office. We have around 45+ employees currently.
Please suggest me some recreational activities which are fun as well as motivating and increases the learning's of the employees, since i do not want to have Children games in office.
Please suggest me some activities ASAP.
-Harsha

Dear Mr. Harsha,
It is very nice to see the HR being the only person who can think out of box -- Motivation at work for employees can be done weekly or monthly. Please CLICK this article, you may want to endorse some from the list.
Each one has its own supportive methods that will encourage team work and boost the enthusiasm with every bit to your employees. Let us know if you need more inputs and we are happy to give you as much we possess.
Good Luck...!