My ongoing D&D campaign is set in the jungles of Chult. I have the Tomb of Annihilation adventure book and while I don’t use its main plot *shudders*, I love the setting. I mean, I could very well have done the same thing with the old Isle of Dread module, but I didn’t know of its existence when I bought ToA. Anyway, I feel like ToA grafted a sandbox to something that wasn’t exactly meant for it. The PCs must find a specific location (the tomb duh) and have no real incentives to explore the fantastic locations on their way (not that there’s much of it tbh). More so, the players have this bigass map with the blanks… well unless you have a really dedicated cartographer player, it doesn’t see much use in my experience. Which is a shame.
In retrospect, what I would have liked is stickers. I’ve discovered the fun of it in my recent experience with legacy-type boardgames (gloomhaven, betrayal legacy).

You’ve found/unlocked a location! Put a sticker!
Nah, really, it’s a thing. I like it.