If this is your first trip to Moab and you're not traveling with an experienced trail leader, I would do these three trails in this order
Fins & Things
Hell's Revenge
Top Of The World
Fins & Things and Hell's Revenge are close to town and easy to find. There's an overlook on Hell's Revenge where you can see the Colorado River and Arches National Park on the other side. It gets crowded from the Sunset Tour bunch. Top of the World is a bit of a trip and not too hard to find the trailhead. Keep in mind there are two ways to do Top Of The World. First is up to the overlook and back. Second is to continue on from the overlook and make a loop. The second half is a bit rougher than the first.
Good scenic trails are Shaffer Road (easy enough a high clearance 2wd vehicle can make it) and Onion Creek (also easy enough to take in a high clearance 2wd but I'd advise against it. Onion Creek can lead you to areas where you'll need 4lo.) Schaffer switch backs up a cliff face and the view from the top is spectacular. On your way back to town, you'll have a chance to head out to Dead Horse Point. It's a great place to have a picnic. It's paved and you an entrance fee must be met. Again the view is spectacular, same as from the top of Schaffer but from a different angle.
Chicken Corners isn't difficult. A stock Wrangler can handle it. There are technical sections that should be navigated in 4lo. Chicken Corners is easily an all day trip.
Poison Spider is my favorite trail so far. The riff raff bump is technical and requires 4lo. I'm told the riff raff bump can be cleared in a stock Wrangler. Maybe. I think it would be a struggle with a good chance of body damage. I had no problems in my 2 door on 35s and broke a tail light showing off. Poison Spider leads to what some call the "Trifecta" which consists of Golden Spike, Golden Crack and Gold Bar Rim. The Launch Pad looks intimidating. If you stay focused and apply the right amount of speed, you'll be find. You won't need much as there is traction to spare.
Kane Creek is fun and has a couple of tight spots for 4 door Wranglers and Gladiators. I'd call it a medium trail until you reach Hamburger Hill. Big tires and good driving skills are needed to clear Hamburger Hill without a winch. If you don't want to tackle Hamburger Hill, you can turn around.
I've never been on Pritchet. Someday.