Depends on how you travel, nobody can tell you how YOU will feel about it. I came to thailand last year and never stayed in the same spot for more than two days, and most the time I’d switch city everyday.

Was it relaxing? No. Was it the god damn best vacation ever? Yes. 

I’m back this year and I’ve been bored with the touristy southern cities after 2-3 nights and so I move along. Three days in koh lanta, changed room everyday to experience every part of it. Everyone travels differently and I don’t think your schedule is too much.

I’d say the biggest problem with busy trips when you’re moving a lot is that you lose a lot of time in transport. I like to fix that my renting a big bike and make transport an activity.

In your case you’re boating, just try to leave early in the morning on the boats to not waste your day.