You can keep that nice "Honey" teak color by scrubbing the decks once a week. Be sure to scrub against the grain.
Myself, I dislike teak decks on a cruising boat for a multitude of reasons.
For bright-work, I used Cetol for many years. If you keep after it and coat it once every other month, it looks great (if it doesn't get chafed). Once the Sun gets to through coating, it must be sanded back to achieve a nice finish.
For someone that is going cruising, has a lot of teak on the topsides and wants to avoid all the hassle, here is a great remedy.
Do a first class varnish
job with about 6 coats (take lots of pictures). Let it set for 60 days, do a light sand with 180 grit paper and put a coat of paint
on it. It will last for years. When you are done cruising, sand off the paint and you will have your beautiful varnish
back. 2 coats and your back on schedule for re-coating every 3 months.
If you would rather spend time varnishing (instead of exploring) while cruising, varnish away.
Cetol (and Cetol like coatings) does not hold up to chafe. Even a boom cover rubbing on a spot, in a breeze will chafe it easily. Dinghy
painters are killers. If the surface gets chafed (even a little) the Sun will get to the wood and it will need to be sanded back before re-coating. Varnish stands up to chafe and salt water
far better. It's just a lot more work.