Hike up to Myrtle Falls from Paradise Visitor Center and aim to get there an hour before sunrise. You will be rewarded with spectacular shots if the weather cooperates.
The hike itself is moderately strenuous and pretty short - about 10-15 min if you are familiar with the area. If not give it extra time or scout ahead as Paradise trails can be a bit confusing to the first timers.
Mount Rainier is makes its own weather and defines what whimsical really means!
After four consecutive failed sunrises due to bad weather (think heavy fog with near zero visibility) I was about to give up - Waking up at 4 AM each day with nothing to capture was demotivating - But I pushed through all that disappointment and decided to give it one last try and low and behold! This is what I got rewarded with!