$18 to go to the observation deck and another $16 gets you unlimited rides. Great value. Was there early evening in mid November. Great night time view of the city. My son (age 25) rode the rides. One time each for tilting ride and spinning ride and 4 times for the tower -Big shot ride. The spinning ride left him feeling queasy. He enjoyed all of the rides though especially the Big Shot. The jump off the tower "ride" was over a $100, did not try that. Have to go thru a metal detector, security point to go up the tower.