Hi, and Welcome to The great American RoadTrip Forum.

You've certainly done a great job with that trip. I travelled it as I read through your itenary. Not familiar enough with the bit from San Diego to the Grand Canyon, but I am sure someone will chime in with that real soon.

If you are pushed for time, Bryce Canyon is pretty much suited to seeing the best of it without doing hikes. Drive to the end, and enjoy all the view points on the way back. In Zion I would highly recommend you do the River Walk and maybe up the Narrows at the end of it. It is not a long hike, and can be done as a lovely leisurely stroll.

Are you aware that when you take a helicopter ride from Las Vegas that you will more than likely not go anywhere near the National Park. All those great views you saw when you visited there, you will not see. Just about all flights from Las Vegas / Boulder / Henderson City go over the West Rim. Whereas it is still a pretty good flight, you might be disappointed if you are expecting to see the spectacular views which the National Parks affords. And if I remember correctly, you don't get to see the Colorado River. Be sure you know what you are getting for your money.

There are helicopter rides which go over the National Park from Tusayan.

Lifey