Possibly the coolest thing to do between now and July 27 is go to Deborah Warner's Angel Project, a performance installation in the Lincoln Center Festival. You show up at the Roosevelt Island tram and then you're sent on a scavenger hunt in the city.
Ben Brantley doesn't want to give away any of the surprises but the Daily News' Howard Kissel does. Gothamist thinks Brantley was correct and that Kissel should have written "Spoilers!" at the beginning of his review.
Updated, July 21, 2003: Gothamist embarked on The Angel Project.