Simon, just a quickie for the moment.

Be careful with coconut land. I can only speak from my experience in Mindanao, but often there are many restrictions and you may find you need a special permit to allow cutting any down. The good news is that you make make a little money from coconut. I don't know how it works in Palawan.

Concerning a map showing property boundaries, you must be sure that what's described to you verbally and what's shown on the title is actually the land that you're buying.
You should have a survey plan. If not there's a number of things you can do.(as well as asking the seller to provide one)

From our experience we always visited the Tax Mapping Office. They are a great help and have lots of documentation for determining the property details and boundaries.
They normally have all boundaries of all land parcels and also have information on ownership identity.

If eventually it's really not clear to you or you have doubts you should seriously consider to engage the services of a surveyor (or even a Geodetic Engineer). The surveyor can organise to properly mark out the boundaries of the property for you.
Most people then put up some sort of fencing around.

Also, if the property doesn't have frontage to a public road, just make sure you have satisfactory access/right of way.

How about access to water? How is that organised?

There's a lot of stuff to think about depending on what you want from the land.
Even consideration to landline telephone access, internet access, electrical supply, water supply etc can all become important if you're planning to build a house.

Step by step.
It sounds a lot when you write these things, but actually it has always worked out fine for us. Maybe we were just lucky.

I've heard some real horror stories, but usually they came down to sloppy work by the purchaser.

To be honest, we've never gone through the process at distance (being in UK), usually all key steps taken when we were actually 'on-site'