Larose - it's difficult to answer your question.
Depending on - how big/heavy your laptop is and how much you want/need internet.
I would not advise you to expect all locations to have free wifi. I think it's heading in that direction, but they aren't there yet. Some places will, some places won't.
The iPhone was great as I could pick up a connection everywhere using their 3G network, even on trains etc.
However I also traveled with a tiny laptop (1 kilo) - the $380 kind you can pickup from Harvey Norman or JBHIFI. Which was great for picking up the free wifi when it was available. And because it was cheap I felt happy I didn't have to stress about it getting stolen or damaged.
Another potion for you would be to take your laptop. And then on arrival at the airport get a portable modem from Dialog. Like the ones we have in Australia.... http://www.dialog.lk/personal/broadband/hspa/packages/prepaid-broadband/
If you have one in Aus that is unlocked, you can use it in SL by putting in a local sim card.
Maybe just buggar it all and go without technology!
Liberating!! (but something I would struggle to do!!)
Happy travels
Kirsty