Laythe is the only one with an atmosphere, so it might be nice if you have a parachute, though not much land mass. Tylo.. I'm guessing you're rover doesn't have that kind of thrust to be able to land safely, so that is probably out of the question You may be able to land on Vall, but again, not sure of your rovers thrust, though Vall does have some nice 'structures'... I'd say your best bet is either Pol or Bop, I'd choose Bop because of its rather angry resident.