[villagetinker]

Without more information, like the location of the downspout in relation to your driveway, my first attempt would be to relocate the last few feet of the downspout so it would drain directly on the driveway. Your current situation may cause the sand under the driveway to washout and cause major repair problems. You may need to get a gutter contractor to review the entire installation and possibly replace the gutter with a different slope so the downspout could be relocated.