CnV - So sorry to see that happen to you, especially since we are leaving for the same pre-cruise trip in about 2 weeks. I haven't heard anything from Windstar yet, so I hope it is still a go.
We did have this cruise cancelled last year. We did not have the land portion for that sailing, as it was going from Colon to Puerto Caldera. I put together something for us post cruise on my own. We were going to go to Tabacon resort for 2 days and then to the Peace Lodge at the La Paz waterfalls for 2 more days. Then we were spending a night in San Jose. I had us getting around using private transfers, as I had no interest in driving. If anything happens with our trip, I'll probably re-create that.
I wonder what caused them to make the late change for you? I had noticed last month that this cruise tour combo is no longer advertised. I did call to ask why and Windstar customer service said they were sold out. Also surprised that they didn't at least offer you something extra for the inconvenience. I'm not big on folks who want cruise lines to give them everything for a small problem, but cancelling this late in the game is a huge headache. Something simple like an upgrade or OBC would be good customer relations.
Take care and good luck on your trip