Honor the Day
The more knowledgeable one is regarding the history of the 17th of Tammuz, the more one can honor the day by marking it appropriately.
Honor
If you know of any Jewish servicemen/women who gave their lives for the country, honor them by visiting their graves.
The Honor of Listening
If you know Jewish war veterans, honor them by listening to their stories.
Honor Thy
It is ALWAYS a mitzvah to honor your mother (and your father). This Mother's Day, show your mother how much she means to you.
Honor The Dead
Give charity in honor of someone who passed away in order to bring reward to their souls.
In Honor Of…
Do something to honor the new month: buy a bouquet of flowers, try a new food, wear a special outfit, etc.
In Honor of the New Month
Do something special in honor of Rosh Chodesh: have a special dinner, get together with friends, etc.