I did a trans-Atlantic crossing earlier this year. There were a lot of interesting entertainment options and good food--and I had plenty of time. Not something I would routinely do as a travel option but given flexibility and the need to get across the ocean in some manner as part of another activity definitely something I'd consider again.
Renting a beach house is very similar to cruising. It's literally a beach house with builtin amenities, restaurants, and no weird trips to the local Walmart.
I've never been on a cruise, but for me renting a beach house does the same. Sleep, eat, watch the ocean from the beach and do totally nothing.
Camping with friends also does it. Let all the kids play together, just sit and watch, doing nothing.
When I was a bit younger I would have considered "doing nothing" hell on earth, but with a busy life it's good to just do nothing once in a while.