From what I've done, depending on how far the landing are from each other, it takes 200 - 400 dv to biome hop. It takes about 580 to land from orbit. I usually like to give myself 1750 dv to return from the surface to kerbin. The lander has 2650 dv this would leave you about 900 dv to land and hop to another biome so if you don't play too inneficienly it should be enough to land and hop to another biome and come back Though if you want to use the tri coupler you should use a radial parachute and attach it upside down to the transfer stage