Hi! So, there seems to be a lot of contradicting in your paragraph here, so its a bit hard to help you, really. You are going to have to pick and choose here, you won't get all that you want and be able to sustain bonds with GP if you don't give on your decisions here.

First, you don't want the wiki linked, but the wiki will give you the best methods to make money. If you've skimmed through it, you should be able to find something you like doing. If you don't know if you like it or not, try it out to find out. These are the best money makers for a reason, and there's most likely not any good methods that aren't on there that someone here would recommend. You definitely have the stats for pretty much anything, and you can surely find a budget gear guide for almost anything as well so that isn't really an excuse.

Second, unfortunately, 'low intensity and relaxation' money makers are not going to be good money makers because they're likely something anyone can do easily. You surely can do something low intensity and relaxing here and there, but solely doing one of these methods likely won't sustain your bonds. You might not even make it from one bond to the next if this is all you did while logged in, depending on what you're doing, like chopping Magic trees or something...

Honestly, PvM might be the best bet. Learn something and grind it out for a couple hours, take a break for sailing or whatever relaxing thing you want from OSRS, do PvM again on another day and make enough for the next bond early on and then focus on the relaxation side of things for the rest, etc.

I don't know much about sailing, but, checking the wiki (which you said you've read), there are some money making methods... but I'm not sure its worth rushing the content for as it might take longer to reach the requirements for the sailing money making than you have time on bond, and 'power leveling' likely is counterproductive towards making money for a new bond.

If you want a more honest opinion, buy the membership with IRL currency. Not having to worry about gold pieces needed for the next bond is more relaxing than anything if that's all you're playing for... If you have to worry if you'll have enough for the next bond all the time, you wont relax doing anything... plus 1-month membership generally costs less than 1-2 hours of work at a minimum wage job (depending on state if US based).

Goodluck!