Beachfront and Lagoonfront

We hadn't been over to our property in 5 months.  First I was away traveling, then I cam back with a broken rib from a car accident, and then they had stopped running the ferry for low season, so there wasn't an inexpensive way to get over.  And then it was rainy season- rain, and more rain.
Finally when the boys were down for Christmas, we decided we'd go over in a private boat for a couple days.  Auri hadn't yet seen the cabin, and I wanted to install full rain gutters (we just had a little piece of one up), and start sealing some of the gaps along the roofline.
We dropped off stuff, and Deo and Auri rode over to the cay to pick up lumber to seal up the gaps along the roofline.  When they got therr, the hardware store was closed for lunch.  2 hours later, it opened, but had no lumber.  I told them to get whatever they could find (a sheet of plywood) and head on back.
At our land, we saw that the back, marshy part of the land had flooded out- the water came up about 30 feet or so behind the back of the cabin.  Then it rained heavily our first night, and we awoke to water all the way under part of the cabin!
What does one do in this circumstance?  Put in the kayak and go kayaking in the backyard 🤣
The weather was pretty bad for both the days we were over- sometimes just blustery and overcast, and sometimes pouring rain.