I would highly recommend discussing the idea first, and also discuss what you intend to do with her after she is restrained, and not do anything that has not been discussed. Also she should have a safeword. People sometimes react in unexpected ways to being tied up, regardless of what they may say beforehand. Also I would recommend a strong, but extremely gentle hand at first, not rough or forceful. Let her feel your strength but without using it AGAINST her. She should not be giving you any resistance. A little bit of reality can go a very long way sometimes. Focus on making the experience as pleasurable as possible for her and don't get carried away with your own greedy ideas.
Also if you haven't been intimate in a while don't you think regular old vanilla sex is more reasonable place to start than something totally new? Like a warm-up before a sprint? Just sayin.
UPDATE: Oh if she's telling you she wants 7 days of freaky new experiences then game on. But please read everything everything in my first paragraph as it comes from my hard-won experience.