Liesbeth; Nook is the ereader made by Barns&Nobles (US chainstore), it's basically the "rival" of the Kindle, sold by
Amazon. As you're experiencing with the iPad; that simply isn't made for digital reading and thus problems with sun, the screen etc. Readers like the Kindle are made for it, so no problem in even the brigthest sun. What I like best of it though; the screen is SO much more relaxing on the eyes than any other screen not designed for ereading. For me personally, it's a more relaxing way of reading that reading an actual book. My eyes can't handle reading a regular book for longer than 15 minutes, but digital I can read for a lot longer.
If you do end up looking into buying an ereader; do it in the US! Prices are dropping here, but still are not really cheaper than in the US and to be honest, I don't like the options and quality of the brands we've got on our market. The Kindle can now be shipped to NL, but that is A LOT more expensive than buying it in the US and having it shipped to your resort. With you staying a week at CBR, you can easily have them ship it overnight to the resort and pick it up at the front desk. Which basically can be done for anything you want to order online. Works like a charm as long as it's not USPS doing the deliveries. (has a hard time finding resorts, I've read on the DIS) I do this all the time. Buy all kinds of stuff on Amazon and have it delivered to me while at WDW. I've found amazing bargains that way that even US stores couldn't come close to matching and I like to get the "must haves" out of the way. Actually, last year I bought my dad his Kindle this way.
Nook also gets good raves, prices are pretty comparable and bonus; you could buy it in their store if you'ld prefer that. The readers that are also on our market also tend to be cheaper in the $-market. Whatever way you go, you can't go wrong there. Don't know about Nook and other brands obviously, but with the Kindle it's no biggie if you run into any problems. My first basically died on me. Called Amazon and literally within 30 hours I had a new one in my hands and was told to ship back the old one at their expense.
As far as customs (doaune) goes; don't sweat it! You need the ESTA-print before you can board the Magic. Even if you've got approval,
DCL will make you re-apply if you haven't got the print with you. Disembarking can be done at your own pace, allthough they'll try to kick you off if it gets "later" in the morning. Busses are running nonstop, so you can simply grab one when you "feel" like it, no need to get there at like 8.30 or otherwise no bus at 9.00. Customs has seperate rows for US-citizens and those of us non-citizens. You use the second row, obviously. These folks are a lot more relaxed and easygoing than the regular customs-worker at any airport. They tend to chitchat a bit, are not as grumpy and not as... thourough as at the airports. At the airport the standard is an eyescan and fingerprints (which always gets me a grumpy scene as they somehow are not used to dealing with people with only 9 fingers, ah well) etc. Nothing of that was the case for us at the ports. Just a few short questions what you are doing in the US, where you are going, that's it.
After that, you hit the busstop, inform the CM working the front where you are going and they'll tell you which bus to board. As soon as the bus is full/full enough it will take off. Esp. earlier in the morning that can be very quickly after boarding. Be prepared that they tend to combine resorts, so you might drop off guests at 2 or 3 other resorts first before hitting CBR. At CBR; have them take care of your luggage, you do NOT want to walk with that yourself as custom house (building you check into) is quite a distance from the rooms. Think Centerparcs overhere. You can catch a ride with a CM if it's not too busy, or hop on the internal bus to your room. Walking isn't that bad depending on location but with luggage it gets bad soon. After check in, you don't need to hit custom house anymore, all other things can be done at the desk they've got set up in Old Port Royal (main building with the foodcourt etc.). Gosh this does bring back good memories, I just love CBR.
But really; don't sweat it for both at the port and airport. You'll do fine. If you have any questions or some things aren't clear because of the english, just sent me a PM and I'll help you out in Dutch.
I am so p'd off right now!!!!! 
