1. Take a small travel clock so that you can  set an alarm you know will go off when it should.  If you have ever missed a flight or a day trip because you didn't wake up early enough or you didn't get the hotel 'wake up call' then you will see this tip as very important indeed.
2. Take plug adapters if necessary.  This can be important when traveling overseas but these days they are getting better at supplying these.  When in doubt though, take one.
3. Rolling clothes is a good way to stop clothes wrinkling in your suitcase.
4. Have a copy of your hotel reservations ready when checking in.  There have been times that they couldn't initially find my booking until I produced the confirmation or receipt.  Funny how easily they find it then
5. Lock your suitcase when leaving it in the room.  You can use the room safe but there are limits to what you can fit in there.  As a general rule I find it easier to just lock the suitcase anyway.
6. Put a collapsed overnight bag/cabin bag in the bottom of your suitcase so you have an extra bag for purchases on your way home.  This has saved me many a time and is useful if you find one of your suitcases is overweight.
7. Always keep receipts of purchases when paying by credit card.  This includes the hotel bill and any purchases at the restaurant or gift shop.
8. Take a travel clothesline to dry clothes in the bathroom.  You can then take less clothes and more room for souvenirs

Follow these hotel visitor travel tips for a stress free time away.  Check the eBay listings for deals on travel accessories.