"something" and "someplace" are the problems here.
What will they like? Which places will be interesting?
It's not at all a given that someone with data and information can't give a more informed opinion on what options are available that may be popular with a set of people than those people themselves.
Why should curated activities only be for tourists on vacation?
There are tons of activities people aren't aware are available, or are aware of but don't know whether would be suitable for them, and which they avoid because there's an opportunity cost to making the wrong choice. Exploring that yourself can be fun, but it's also hit and miss.
The biggest problem to me with this idea isn't the idea that they can do better, but that even the founder took an emotionally charged situation to get to the point of verbalising that this was what he wanted. Wanting to help people who aren't necessarily aware that there's an issue someone could solve for them is tricky.
I live in London. There's stuff to do all over the place. If anything, the challenge is filtering and curating. I'd love a site that did it for me. Especially if it could also book things. Heck, I might even pay for personalised recommendations if it could cut the time I spend on choosing.
But I don't think I'm typical.
I suspect a lot of their potential userbase would be really hard to reach.