Mars and the moon both have less than half the gravity earth does. We should be flying there. Venus has surface temperatures in the hundreds of degrees plus acid rain. So none of the current planets are realistic. Plus Jupiter and Saturn have moons almost as big or bigger than mercury. We could be going to one of them.

If we can go to a planet with acid rain we can go to a planet with no natural surface. I am pretty sure if we could figure out how to teleport we could also set up a flying airbase or visit an enemy airbase on another planet. Besides, we could go to one of those planet's moons instead of the actual planet.