US citizen not needing visa to enter Philippines

So I have a few questions. I’ve looked around online and as a US citizen I should be able to enter the country with no visa, as long as my stay is less than 30 days, right? What else would I need to enter? besides passport and a booked flight home.

Is it easy to get flights or boat rides between islands booking them same day? I don’t want to have a set itinerary, I would just like to wonder around.

Are busses and taxis readily available to explore the islands with?

This is my first flight out of the US and I’ll be alone so I may be over thinking it. I could use some advice.

Mods I am not asking for help planning my trip so stop deleting my posts using that excuse.

US citizen not needing visa to enter Philippines