Bring a rain jacket!
This is an opportunity to see primary forest, that has not been cut down; this should be one's primary focus in coming to Monteverde, the real deal cloud forest, before one ziplines, visits cheese factories, and does all of the heavily promoted commercial tourist stuff.
There are extensive trail options here, some could take 3-4 hours. There are also shorter trail options that are good for kids. I would recommend planning a day here, some with a guide.
The shorter trails we went on were actually well built, even paved and I wonder if you might plausibly go through them on a wheel chair (with someone strong pushing). We only did the short trails because it was very wet, we had kids with us and the family got cold. I wish we could have pushed in deeper.
We arranged to be on a tour with Orlando (he is mentioned in other reviews). This was arranged at the ticket booth. We signed up for a "public tour" but the group size is very constrained and it turned out that no one else signed up for him for that slot. So our family got a private tour. We really appreciated his knowledge and care. The post cards in the gift shop are all from photos by Orlando.
There is a cafeteria and nice gift shop at the base camp.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.