Duck McFuddle

Hello, and welcome to the forum!

Depends on what you're after, challenge level, etc.  The easiest planet to visit-and-return is generally Duna.  The dV requirements are very modest, the fact that there's an atmosphere makes landing easy (good for aerobraking, helps with landing), but it's thin enough that taking off is easy and you can use "vacuum engines" there no problem.

It only takes barely more dV to land on Duna (assuming you aerobrake) than it does to land on the Mun.  Coming back takes a fair bit more dV than coming back from the Mun... but less than it would from any other planet.

Duna's probably your safest bet.

By the way-- if you've got this kind of detailed question, you'll probably have better luck posting it as a topic in the "Gameplay Questions" forum than here.  It'll get a lot more visibility and you'll have plenty of responses.  Whereas a status update on your profile tends not to get many folks looking at it. 

Thanks, I was going to try Duna but just wanted to make sure nothing else is easier. Funnily enough, I sent a Jool probe first because the gravity well is so huge. But for landing I will for sure try Duna first. And thanks for the suggestion, I will post on the game play questions instead. 

By the way, Eve is a pretty easy place to land a probe... as long as you're not coming back. Great for early game one-way missions.

Just don't send anything you want to bring back, until you're a KSP expert. Getting to Eve orbit from the surface is a real bear, and takes a lot of skilled design and piloting.