UNDATED — Nik Wallenda practicing a walk on top of the Ferris Wheel at the Santa Cruz Beach Boardwalk for his performance on Saturday, April 16.UNDATED Handout photo of daredevil Nik Wallenda who is attempting to cross Niagara Falls on a high wire. If he succeeds, he will be the first person to do so since 1910, but bureaucratic approval from Niagara Falls Tourism and New York Gov. Andrew Cuomo, is still needed. HANDOUT PHOTO. For Amy Chung (Postmedia News) NIAGARA-WALK Can be used with Sarah Boesveld (National Post). NIAGARA-TIGHTROPE