Right, sorry this took so long! I had to do some digging for this one. For resort worlds, I was pretty loose with the definition, but if they aren’t exactly resorts then they are certainly shady and have plenty of places for gambling and criminal activities. As well, there will be places on many planets where high-class criminals do business (some places on Coruscant, for example, would work very well) but these worlds are just better known for it:
Cloud City (Bespin), Keyorin, Llanic, Nar Shadda, Ord Mantell, Pembric II, Kerev Doi, Corellia (certain places, such as Treasure Ship Row), Mon Gazza, Ord Antalaha, the Lol sector and specifically Kendamar, and Pavo Prime.
As for Imperial mining worlds, a whole lot of planets with significant resources were taken over during the Imperial era, so if you’d like to look through the mining planets category you will find quite a few that work. This link specifically will take you to the category intersection for Imperial worlds and mining planets, for a more specific but less comprehensive list.
Generally, you won’t find heavily populated planets that are considered poor overall, especially if they have valuable resources. The planet itself will be quite rich, but the wealth will usually be highly concentrated among the corporations that own the resources, which in most cases are metals, minerals, and tourist destinations. Try looking through the ecumenopoleis; most of them will be very densely populated, and will have some large source of revenue that allowed them to get that way, which means they will have very poor areas as well. Coruscant and Empress Teta would be good examples.
I hope some of those work for you!
~ Jacen