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We were there a few years ago. Didn't do the hike, but from my research, it doesn't look strenuous at all. Altitude will be a factor... can you spend a few days in Cusco before starting the hike?

MP is my wife's favorite place on earth. We hiked up to the Sun Gate to view the site, which is where you'll emerge after your 4 day hike. It really is beautiful. Expect quite a few people to fight for elbow space with in July. We went in February when the trail is closed for maintenance and even then, it got real busy after 10 AM or so.

If you're in to ceviche, make sure you explore the scene in Lima. Its awesome. Cusco also has many, many nice restaurants and lots of character. Not to be missed.

Don't spend too much time in Aguas Calientes. Its an awful little town, although the locals are very polite and friendly.