When I join the world, I'm in creative mode. There's no button to change to survival and I can't use that command in a command block. I tried creating a copy of the world, but none of the buildings were there. Please fix this.

I played your map. You can watch my reactions below if you want:

Rayleor Tower

Woodland (Part 1)
Woodland (Part 2)

Sandstone (Part 1)
Sandstone (Part 2)

Little Fort (Part 1)
Little Fort (Part 2)

Finale (Part 1)
Finale (Part 2)
Finale (Part 3)
Finale (Part 4)

Loved the story and the map! Good job! You should create more adventure maps! You have a unique way of creating adventure maps!

One of my favorite maps, can't wait to see the update

Woaw, very good map man!
I was looking for a good adventure map to begin the summer and I haven't been disapointed.
The story is really interesting and the constructions, mainly the sandstone castle, are beautiful.
But there is a few things you could change to make it even better. The survival mode is usefull to break clay but when you die with the key on you it's kind of annoying, maybe using the adventure mode would be better. And perhaps you should script the map a little more, I didn't lose myself but sometimes you open the wrong building and go from note 10 to note 15 without understanding why.
But your map was a good surprise and I really enjoyed playing it :)

I have played alot of Adventure maps as they are my favorite Minecraft map type.  When I saw the "Father" series I was excited to see what was in store for me in this adventure.  I was impressed until I lost the lab key in the lava.  A specific frustration I have with this is that when I dropped the game file in my saves folder and started it, it loaded a "No Cheats" mode.  With that said, I cant change modes to get a replacement key or even a redstone torch to see the effect of opening that door the way the creator meant. Luckily its not in Adventure mode otherwise I wouldn't have been able to get through that door and complete that level at all.  But since it's in Survival mode and I can get around unforseen obsticles, I will continue playing and update this post as I see fit.

Hey me and LongEaredFox played your map and loved it 
Here's a video if you wanna see how we got on with it 
but we thought this is one of the best maps we've ever played cannot wait to record the second map!

www.youtube.com/watch?v=az7ajapeW6Y

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Sorry dude but map is bad