Fasting and reading your post from Bangladesh. Fasting has so many good side effects, that's why it called the month of blessings.
You said it very correct, we can use our spare time; the time we would do eating; in many positive activities. And I think it's the best time to set some positive goal in our life (as we are prohibited to do certain works like lying or doing some misdeed with others); so we can easily try to avoid that for the rest of our life.
Thanks for sharing your good words.