Pam, I understand your pain. I had a number of issues with destinations on Navigator in October. Folks need to know that there are issues with destinations/ground arrangements.
One issue was that at least two of the "paid" excursions that were $99 in advance were only $89 on ship. Even if you are not planning to cancel and rebook to take advantage of shipboard credit, you should check to see if price is cheaper.
There was a museum visit to Peabody Museum that showed a retail price of $299 that was sold for $99. It provided transportation to museum and then a ticket with a value of $15. I thought they would catch their error but never did.
The destinations desk on Navigator had no interest in hearing any feedback. They had a form letter wherein they used a different font for port and tour name so you could see that they didn't even try to make personalised.
I, too, like porterage and the convenience of using Regent ground arrangements but may need to rethink that.