Here's what I generated using the automated tool posted on these forums (an OGRE?). Then I tweaked them to add more terrain and other ideas and stuff from the donjon generators. They walked right by the Temple of Ooze so I have been using the rescued halfling to encourage them to return for treasure.
Day 1:
Travel: Dark, narrow tunnel, Walk past Temple of Ooze, a shimmering within
Rest: Ochre Jelly
Day 2:
Travel: Dim light, Wide tunnel, Warning Sign “Demons Ahead!” in Duergar Runes: a non-dwarf touching it must SaveWis10 or gain 1 Madness. A pile of rocks and boulders litter the passage, a Quaggoth yeti is squashed still holding his greatsword, and a severed demon horn
Rest: An invisible Barlugura demon attacks.
Day 3:
Travel: Dim light, Boneyard, a great cavern, phosphorescent light, floor a pit filled with bones, 3 large horn headed skeletons attack.
Rest: Dim light, Webs amongst 14 torchstalks, An obsidian egg smeared with webs and spider blood. When thrown at a target, the egg explodes into a 20'r burst of spiderwebs (DexSave11).
Day 4:
Travel: Dim light, Single-file, long ladder above, 1 chuul lurking in a pool of water, a patch of 4 “barrelstalk” mushrooms, good for storing water and eating. A large pearl (300gp) in the pool.
Rest: Dark, Traders with 2 drow, 1 drow elite of House Xorlarr (Zool, Imi and Noor), 5 quaggoths with greatswords, 1 giant lizard with 300gp, explorers packs, 6 days of food, a cask of wine, 6 daggers, 3 crossbows, 40 darts, 3 vials of poison, 4 silver swords, chainmail, 1 Elven Cloak, 2 potions of healing, Carved Wooden Staff studded with Silver (500 gp), Ceramic Urn (80 gp), Electrum Amphora set with Fiery Yellow Corundum (4000 gp), Silk Robe threaded with Bronze (200 gp), Silver Cloth Gown (1600 gp)
Day 5:
Travel: Crystal clusters glowing pale purple 10’. Smashing crystals causes an intense burst of light. (12)
Rest: Dim light, Giant “rocktopus” slithers in.
Day 6:
Travel: Dim light, narrow tunnel filled with a massive carrion grub. The grub is feeding on something. If attacked, it defends itself with noxious gases.
Rest: No encounter
Day 7:
Travel: Dark, Shelter, Ambushers with 1 umber hulk bursting out of a nearby wall, A humanoid skeleton or corpse wearing a salvageable suit of plate armor (your choice)
Rest: No encounter
Day 8:
Travel: Dim light, Boneyard with No encounter, recent deaths, blood and stench
Rest: Dim light, Escaped slaves, 2 moon elf commoners desperately searching for a way out. Brinnie and Mac, amazing athletes and sort of cocky.
Day 9:
Travel: Edible Fungus Cavern: Barrel stalk, blue caps, ripple bark, water orb, tongue of madness. (50 person days of food!)
Rest: No encounter
Day 10:
Travel: Gorge 300ft deep, 120ft wide: Find a way across, go down and back up or find another path.
Rest: No encounter
Day 11:
Travel: High ledge: 18inches wide above a ravine. Miles of this.
Rest: No encounter
Day 12:
Travel: Dim light, Sinkhole
Rest: Dark, Giant “rocktopus”
Day 13:
Travel: Dark, Cliff and ladder (60 feet high), 4 Spore Drow Servants
Rest: No encounter
Day 14:
Travel: Dim light from 3 torchstalks, Webs with 1 giant spider, Society of Brilliance: Grazillex the MindFlayer is caught in the web, asks for help, offers a Traveling Scroll: “Expeditious Retreat, Longstrider, and Pass without Trace”. He is investigating the sudden influx of demons in the underdark and his own sudden change of perspective, shows his Purple Society Gem indicating his membership. They all have one.
Rest: No encounter
Day 15:
Travel: Horrid Sounds of gibbering screaming, moaning in a twisting maze of tunnels that glow a hellish pink with Fire Lichen: Intelligence20 to escape. Madness Wisdom Save11 for each failed check. (Madness +1)
Rest: No encounter
Day 16:
Travel: Rope Bridge
Rest: no encounter
Day 17:
Travel: Dark, Gorge (600 feet deep)
Rest: No encounter
Day 18:
Travel: Dark, Single-file, Ambushers with 8 giant spiders clinging to the walls or ceiling, None
Rest: No encounter
Day 19:
Travel: Ruins of ancient city. Each character finds each hour: A bronze gauntlet torn from a clockwork suit of armor, An oil lamp of dark iron, set with constellations of tiny gemstones, A wooden walking stick carved with five draconic heads, An ivory pawn carved in the form of a vampire, A wooden walking stick inscribed with an impossible prophecy, A leaden merchant's weight which weighs less than it should, A quill pen crafted from the feather of a pegasus, A pewter pyramid inscribed with “What it is”, A small leaden box which contains a shard of glowing spellcrystal, A silver collar crafted in the form of a winged serpent.
Rest: No encounter
Day 20:
Travel: Dim light, medium tunnel fits Two-abreast, Mad stone giant ("I can't take anything seriously. The more serious the situation, the funnier I find it") blocks the path, laughing. He's stuck. He is talking to an obsidian statuette of Lolth 5ft tall worth 1000 gp
Rest: Dark, Giant “rocktopus”