How do I get to the other Inazuma islands right after getting the travel permit?

I completed the quest that gives me the Travel permit that allows me to freely move in Inazuma, but how do I get to the other islands?

I don't see any high points where I can successfully glide from one island to the other, and swimming is completely out of the question.

Solution 1:

Inazuma is host to a traversal mechanic not available in Mondstadt or Liyue, which makes a lot of sense given the nature of the nation of Inazuma which is a collection of islands separated by vast stretches of water, that being Waveriders (i.e. boats) which you can summon via a Waverider Waypoint which looks like this

and appears on your map as

Which allows you to navigate the seas between the Inazuman isles without needing to glide or swim between them (just don't try sailing a Waverider back to Mondstadt or Liyue lest ye be smote by the lightning of the almighty Shogun)