A Pleasure trip.
Washington, December 29.
--It is stated that the United States steamer Do Soto will leave here in a day or two for the West Indian, having on board Secretary Seward, F. W. Seward, and others, who are about to take a trip.
The De Soto has just arrived from Cape Haytien, but will be ready to start immediately.
She is one of the fastest vessels in the navy.