@Steve *********
Everything is at the discretion of the immigration officer, but if you do not have any recent prior entry history, my understanding of the new guidelines is that you may enter and obtain a total of 90 days — that is, a 60-day visa exemption with a 30-day extension, as before — and then make a border crossing by land or air to receive a new 60-day visa exemption. However, you can only obtain a seven-day extension on the second exemption if you arrive by air.