The Olympic park has several attractions available in close proximity to each other. They have smartly figured out that selling passes to all of them as a package will entice naive tourists and they make much of the fact that you have several days to use the pass and each of these attractions "if you do them properly" will take several hours.
So here's what we thought. We went (2 adults, a 7 year old child), were talked into the pass and used it over 2 days. We did not see all of the attractions because it is exhausting to take all of them in. In addition, they are not all close together, so part of your exhaustion may be moving between them (Insectarium and Botanical Gardens together, Biodome, planetarium and the tower grouped to ether). And after you've spent a couple of days there, don't you think you're going to want to go somewhere else in the city? It's not like they've got a watermark or kid-friendly restaurant that's going to keep your kids coming back for more.
That's why my advice is to be selective, because each thing attraction is really interesting and it's fine to just take one day to see one thing. We loved the biodome even though it was so crowded. You will get to see animals that you probably only know in animated form. The planetarium was great too, but best for geeks since you are essentially having to sit still and ponder the universe while Philip Glass plays in the background. It gets bonus points for having bean bag chairs in tone of the shows.The tower is a fun ride and an interesting view, but I can't believe we paid so much for it. Without exception, people seem to spend about 10 minutes up there. Maybe you spend more time if you were at the '76 Olympics and want to reminisce?
We never made it to the insectarium or the botanical gardens because we started walking and our 7 year old hit some kind of wall. Frankly, I was done too.
Definitely recommended, in measured doses.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.