Tipping the front desk can work
You don’t have to break the bank to get a bottle of complimentary wine or the room with the best flat screen. No, thanking the desk manager with a $20 when you check is often enough. It could mean extra charges get dropped; late check-out times offered; or even help "remind" him or her that the room with a lake view and large bathroom is, in fact, vacant. Remember: Not all rooms are created equal. And it can't hurt to be friends with the folks who are in charge of doling them out.
Just like with flights, you could get bumped
Or “walked,” as they call it in the hotel biz. This secret won't save you any money, just a whole lot of hassle. Bottom line: hotels, like airlines, overbook to compensate for inevitable no-shows and cancellations. Generally, taking this gamble works out for the hotel, but every once in a while, there are too many people and not enough rooms. While they do have to cover the cost of putting you in another hotel, they don't usually offer any compensation for your inconvenience -- so, unfortunately, no vouchers for free rooms. That said, checking in early is the best way to ensure it's another customer who gets sent down the street, and not you.