Ruby on Rails

I have a rather large application in rails 2.3.6 (about 40 controllers
and 20 plugins) with a working version in 2.3.11
I am planing to upgrade to rails 3 and at the same time upgrading to
html5, css3 and to jquery

My question is the following

Should I try to upgrade the existing application as described in e.g
the book Raisl 3 upgrade handbook, rafactoring all of it ??

Or should I Generate a new Rails 3 application copying the code action
for action method for method from the old application at the same time
as I am refactoring the copied parts ???

Any-one that had the same problem ?
Any experiencies of these approaches ?
Which one should I use, considering that I have not implemented any
tests ? (Will do that at the same time)

Grateful for any advice abot selecting approach !

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