Come June, Fremont Street will debut a high-flying multimillion-dollar attraction. A five-block-long zipline, dubbed SlotZilla, will spit riders from the mouth of an 11-story slot machine for a 35 mph glide above the neon cacophany of downtown. (A slower, lower version is also planned.) Hawaii-based company Skyline, known for zipping riders over waterfalls and forests, is constructing the $11-million project. Rides start at a more modest $20.