Right location too. We visited my sister in Princeville last March and hiked that trail as far as the river. It was our first trip to Kauai and it was as knock-yer-sox-off beautiful as people have said.
As for boats we still are using our 42 footer but are moving to downsize to around a 32. We are boating as much as over the past many years but sailing less. We can also see a small travel trailer or motor home to explore some of the land areas more while we are still hike-capable. Stats: Captain - 64 and fit. Still doing Olympic distance triathlons. Admiral - a couple of years younger and does group fitness classes 6 days a week. We have both been lucky with osteo issues.