BBQ ideas: Gates, Joe's Kansas City, or Jack Stack are great options.
The Arabia Steamboat Museum on the north side of downtown is interesting. They dug up a steamboat that sank in the mid 1800 and have all the good's it carried on display.
The Liberty Memorial National WW1 Museum is amazing if you like history. It's the only big WW1 museum in the country.
If you like art, the Nelson Atkins is a top ranked gallery and it's free.

The big St. Pat's parade is on Saturday. If the weather's good, the people watching at Power & Light will be rather entertaining.

If you drive south into KCK on 69 HWY from Argosy you'll pass through a rough area. Not a good place for an evening cruise.

Good luck.