Should I use verb or verb + ing in the following case?

Solution 1:

Just watching trains come and go is fine, and so is just watching people get on and off. A problem arises when you try to put the two together. If you write Just watching trains come and go, people get on and off, the syntax isn’t immediately obvious. It sounds as if people get on and off is a new finite clause, when get, like come and go is, in my view, a bare infinitive. It will be clearer if you write getting on and off, but if you use that, it might be as well to change come and go to coming and going to create a parallel structure. That, however, does create rather a lot of -ing forms, one after the other.