Near the end of a date, how to judge if you can invite the girl to a hotel with a pretext? You know, if you prematurely invite a girl to a hotel, the girl will spot your intention and never go out with you since then.
Please advise.

I don't really understand. There's no way she won't spot your intentions unless she's as stupid as a stone, it doesn't matter when you invite her from this aspect. What really matters whether she wants to go home and bang you or not. You should be able to calibrate and know when you have enough attraction and comfort. If you don't then learn to calibrate. Try closing every girl you open. This is the only way you will learn this.

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So you want to trick her into bed? Why? Because she'd never want to sleep with you otherwise?

Just say "let's go somewhere else" grab her hand, lead her outside, grab a cab and go to your hotel.

Your intentions should be clear. Yes, you may have to say things like "lets go watch this really cool movie I just got" or even something like "after party" works to over come her logic. But you shouldn't be trying to "trick" the girl. A guy who is not "clear in his intentions" will creep the girl out. Don't be a creep.

That's not true at all... and it is one of the most difficult things that we as men need to realize and overcome while gaming... Escalating, stating your intentions, inviting her to a hotel, etc. as long as you are not pushy, will never damage the relationship between you and her.
Even when she rejects you at the moment, and say that whatever you suggested will never happen. Chances are that if you are cool with her reaction, eventually what she will be the one suggesting to do what she said that will never happen.
The only risk about escalating is that you might take things to the next level.