I was reading a post about the fastest way of traveling. Someone suggested traveling by minecart through the Nether, as this was a 8:1 ratio or something. Now I thought what if you encounter a lava lake? Building a bridge over there just to lay some tracks down seems like an awful amount of work. So here comes my question: are you able to simply catch a boat and sail across the lava lake?
Boat float on lava? Yes
Sail the boat? No
The player may place boats in lava, but if they try to ride the boat it will break and they will fall into the lava.
Using a Splash Potion of Fire Resistance can cause boats to be immune to fire.
When riding a boat through lava without it dying, it will attach to the nearest block and will not be ridden like a boat on water.
"(...)if you use a fishing rod to pull yourself forward then?" – Marco Geertsma
It doesn't work, the boat doesn't move if you use it, and it doesn't move on water with that technique either. And it would be annoying fishing with that.
No, you are not. This is completely illogical... You can place the boats into lava but if you try and use it, you will fall into the lava and die horribly.
Read this for more information: http://www.minecraftwiki.net/wiki/Boat