Which skills are you interested in? We'll help you get a template going for some stuff. Just let us know what you want to try first.
Blackthorns Castle Dungeon has Earth (EDIT: Gold) Elementals that are only slightly harder than the Earth Eles you probably remember. They are a popular farming spot. Everything is pretty separate and on it's own spawn for easy farming.
There are brigands with a single executioner that keeps to himself unless you try to get to him. The executioner is tough but doable in the 80 skill range.
There are greater dragons/dragons that are tough for melee beginners, but if you look up "Sampire" they have easier times with everything. They get skill in Necro for a spell that gives enormous life steal so they take a lot of damage, but get it back as they hit stuff. It's a popular template, but not really new player friendly. The greater dragon and a single Balron are the toughest thing in the dungeon outside of the weird rooms in the back I haven't fiddled with.
There is a library of liches.
There is a room of giant spiders that are easy for melee. Just bring some orange potions to cure poison if you get in trouble.
There is a room of ice stuff like snow elementals.
I think that's it. All relatively easy after training up on New Haven Island a bit.
Titans are just something to farm. If farming in Ilsh they have a chance at a paragon version that is tough to run from and about 3x as hard as a normal version. The normal versions drop good gold and loot. The paragons drop even better loot and a chance at a paragon chest with more stuff in it. I'd rank titans up there with Liches. Maybe a bit harder. Reponds are a slayer weapon for humanoids and giants like titans/Cyclops/Ettins.
Trade agreements I haven't tried much, but they give good gold when you get the rewards. You go to a city and a trade person will give you a crate to put goods into. You take that crate to the town they tell you too. On the way things will spawn to attack you. If you run from them it lowers the loot at the end. I also think Moongates are not useable or lower the reward to the point that it doesn't make it worth it. Obviously the trouble with these is going to islands without recalling or gating. You'll need a ship. And I've always had more trouble with water born monsters.
High Seas is an expansion that lets you get a more controllable boat with cannons and attack merchant/pirate ships. It also increases the fishing stuff. Merchant ships are by far the easiest way to get high quality resources like Barbed Leather, and Valorite, and the rare board type whatever it is that escapes me. Yea... wood has types now.
I personally like the plant system and fighting paragons. I'm trying for a chest from every paragon because they have a tag on them that says Paragon chest from Titan for example.
EDIT: Oh hey, Mysticism is the easy taming thing. Just grinding Mysticism up to 100 and start dropping their summonable Raging Colosus and it's just as good as a greater dragon tamers have. It's a lot easier to train up too.