Methana is popular with Greek tourists, many drawn by the therapeutic sulphur springs. Bareboat charter yachts are less frequent visitors, many I suspect put off by warnings in the pilot book about the smell. Those who have braved it seem to agree the odour is greatly overstated and rather a non issue.
The town sits on the east side of a volcanic peninsula. Fortunately none of the 32 craters are active; the last eruption was nearly 2000 years ago. There’s a good walk up to the largest crater but it starts about 5 miles out of town and a better starting point is Vathi.
The sulpur springs tend to appeal more to a certain generation, making the town feel like a smaller Greek version of Bournemouth. I’ve never managed to find the baths open but a friend who did described it thus:
It’s rather like I imagine a Russian psycho ward would be; all hard faced women in white with cigarettes hanging out of their mouths, and scary rooms that fill with water. I quite enjoyed the experience myself!
If that doesn’t appeal, I’d suggest you hire some wheels and go explore the interior (where there are of course assorted ancient ruins), visit one of the several nearby beaches or just relax in one of the sea front cafe’s.
The marina is south of the town and you’ll usually see the masts long before you find the entrance. The mooring lines are caked in sulphurous mud so prepare to swill off the foredeck (and foredeck crew)! When the marina is full, it is usually possible to moor in the ferry harbour in front of the town.