For art lovers--Nelson Atkins Museum. Do not miss this or you will never be able to live with yourself. Construction is taking place soon, but it won't affect the magnificent art work inside.
Sports fans--Arrowhead and Kaufman Stadiums are home to the Chiefs and Royals. Check them out if you're a football or baseball lover.
Gamblers--Several casinos are set up along the waterfront for gambling entertainment. Choose from The Argosy, The Flamingo, The Station Casino, and others.
Nightlife--The Westport area is full of entertainment, from Stanford's Comedy House to several bars and pubs.
Food--KC has a mixture of different and unusual places to eat. Barbeque is the best, but try other specialties like sub sandwiches and grinde
Quick Tips:
Bring many choices of clothing. You never know what the weather in KC might be like. Plan on shorts and t-shirts in summer, jeans and over-coats in winter.
Best Way To Get Around:
While on 'The Plaza' you must take a trolley for a *truly* Kansas City tourist trip. Walking is fine too. Unless you're a long-distance jogger/walker/biker, I suggest renting a car to see sights more than two miles from your hotel. Public travel is sketchy and unreliable.