Jungle Treks is a DMs Guild book that contains 6 scenarios that you can plop into your Tomb of Annihilation game to keep the jungle portion spicy. From what I can see, these can be used in any campaign, really, with almost no adjusting at all.
This is written by Teos Abadia and Eric Menge, who have both made a lot of D&D stuff.
The entire book looks a lot like a 2nd edition product, right down to the fonts. I find it very comforting. Check out the logo on the cover:
This book has 6 adventures that you can use to plop into your Tomb of Annihilation game. There are summaries of each in the beginning. As soon as I saw the words "tropical harpies" I got more than a little excited.
All of the adventures are made to be scaled. There's three "tiers" for characters level 1-4, 5-7, and 8-10. In each adventure, you're given stats appropriate for each. For example, the DC of a saving throw could be DC 15/17/19. Use 15 for a group of heroes that are level 1-4 and use 19 if your group is levels 8-10.
They actually make charts to tell you how many monsters to use depending on what level your group is.
Let's go through these scenarios real quick.
Tavern Trouble: This is one big encounter in a tavern. There's a bar fight, and there's all these lizards running around. The group needs to identify and nag one particular lizard. Very amusing!
If Looks Could Kill: This is an expedition to take care of a herd of one of those really weird D&D monsters - the catoblepas (the plural form is "catoblepones"). There is a ton of detail on the NPCs that will interact with the group, including a lot of notes about romantic interests. Each of them has a quest involving the Catoblepones.
Wow, check out the catoblepas stats. Their death ray does 36 necrotic damage! Yikes.
Ambush From Above: This is an ambush encounter involving grungs who worship a pig. There's a cyclops in the mix, too. People never use cyclopses in D&D and I don't know why. Too mythological?
Mystic River: This is a good idea - an encounter for groups canoeing in a river. There are a series of cool challenges here that will make this a very memorable, fun encounter. This is easily my favorite so far!
Mudslide: Wow.. I just made a mudslide encounter yesterday! This is very well thought-out and extremely useful. They actually go over the options the group has to avoid the mudslide, including jumping from tree to tree, which sounds really awesome. I love this one.
Beautiful Plumage: Here we go! Tropical harpies. Hey... they have a name for a flock of harpies: A "scream" of harpies. Pretty good!
Here's the description: "...bipedal creatures that combine the worst aspects of a human and a bird with feathers that are as brightly colored as any parrot."
Someone make some art of that! Very cool idea. I like this one a lot!
This is the biggest of all the adventures. It has a complete set of ruins, a maze, a tower, and other entities lurking about.
Overall
This is a really easy thumbs up from me. It takes just a few minutes to read one of these, and then you can roll it out in your game. It is extremely handy for DMs who don't have a lot of time to prepare for their games. Plus, it is very inexpensive. $4! Definitely worth it.
Note: I was sent a free review copy of this book.