iPad Google Calendar full synchronization

This is simple tutorial that tells you how you can integrate ALL your Google Calendars, Contacts and mail with iPad built in calendar and mail apps. I'm writing that post because it's not so wide known how to do it -  especially because Apple tells you to synchronize your contacts by iTunes. And Google prepared everything for synchronization but is silent about it. It even hides it from people around the world.

Basic synchronization
When you add gmail account to iPad settings you can synchronize just one default calender and get/send emails. This sucks! I've got like six calendars and want them all. Oh, and you can't synchronize contacts. Come one, it's 21st century and Apple says to sync via iTunes... are they kidding me?

Full synchronization
How to do it? It took me some time to find out by it was worth it.

1. If you have basic synchronization remove it form your iPad.
2. Go to m.google.com/sync
1. If your language is not US English you will probably get error that 'your device is not supported' - it's a lie.
2. On a site there is a link to change a language. Click it, and choose English US.
3. Sometimes it does not work (for me it doesn't on Opera) so I use Chrome browser with US English Language set as default (I'm from Poland) then magically my device is supported.
3. On the site click "iPhone Read setup instructions"
4. There will be tutorial on how to synchronize iPad with GMail, Calendar and Contacts. Basically you have to set up your gmail account in iPad as Microsoft Exchange account.
5. After you're done with tutorial you can:
1. Receive and send emails with built-in app
2. Synchronize Contacts with built-in app
3. Synchronize Google calendars with built-in app

How to synchronize not your own calendars?

On Google Calendar I subscribed Polish Holidays calendar. There are such calendars for every country. By default that calendars can not be synchronized with iPad. But there is way do it. 

When you go to https://www.google.com/calendar/iphoneselect you can see all your Google calendars but you can't check Holidays calendar :-(

You need to go with you iPad browser to m.google.com/sync (change language on site if not US English), then you will get list of devices. My list just have iPad, click on it. You will see screen like that, with holidays calendar (Święta polskie - in Polish) able to check for synchronization.

 You should be able to select even holiday calendar (not own by you). At least it worked for me :-)

My only question is: Why Apple and Google made that so difficult to synchronize and hide that information from users? Lack of full integration between iPad and Google services was killing me, and it took me like a month till I found out how to do it.

I hope this post will help you all to take full advantage of iPad and Google Calendar.