Hi Caroline 
You will be able to take the helicopter flight without missing out an anything. The itinerary looks like this: 
Day 2 
Morning included city tour 
Afternoon optional helicopter flight 
Evening optional excursion 
The Golden West tour is one of our most popular year after year. It's extremely good value too, so if you haven't seen America's West Coast before, it's the perfect introduction! 
Kind regards, 
Olly, your editor