Depends on where you are. Many places it is not legal
for someone unlicensed for carrying passengers to carry them. I'd imagine some of the charterers expressly forbid it, and doing so would void your contract
with them. It is at least unwise to intentionally risk being arrested in a foreign to you country.
And, in my opinion, you lack the experience to take on passengers. I'm sorry to sound negative to you, but your responsibilities are to the welfare of boat
and the crew, primarily, and as far as I know, you've never been a skipper
unsupervised, nor even seen a coral
head! There are ways inexperienced people can get in difficulty in coral
waters, or simply just stone reefs
, from visual and timing issues they did not anticipate.
Please don't do this at this stage of your learning