Going past Giant's Ledges, to Panther, is pretty nice and fairly short... about 7 miles round trip, or you could shorten it up by turning around at Giant's Ledges.
I hear that Kaaterskill Falls is nice but I've never been there.
Or you could do Devil's Path, starting at Indian Head and doing however many of the peaks you want. There is a 10- or 12-mile loop that starts at Indian Head, goes over Twin and Sugarloaf, and finishes with a mile or two on the road back to the Indian Head parking lot -- this is not exactly lazy, but you can shorten it up by bailing out either after Indian Head or after Twin. There are side trails at either one.http://en.wikipedia.org/wiki/Devil%27s_Path_%28Catskills%29