It would be really nice to have a recommended Scenic Route or Motorcycle Route for an alternate route option.
Two points about that.
First is that Waze is designed to get you to your destination in the quickest time, and not taking you on a nice leisurely drive. Sounds like an idea for a separate tourism GPS type app though.
Second is for future Waze APP feature requests, please post them here: https://www.waze.com/forum/viewforum.php?f=657