There is a YouTube channel,Motorcycle Experience season 27. They do 4 day trips out of Vegas and rented. Ike's from Eagle riders. Should provide you with some ideas along with visuals
Here is the link to the cycle show. It has information on Eagle riders and the deal they got on the hotel and routes taken. Lots of other stuff in the show too but this is the focus.
Zion National Park is less than 3 hours from Las Vegas and is one of the most naturally beautiful places in the country. This time of year Zion is not as crowded as it is later in the year and is a great place to spend a day.