The only way to get your money's worth out of these passes is to do both the Kennedy Space Center and Legoland, because with COVID, a lot of the covered attractions are closed. You will break even if you do both Kennedy and Legoland once each on the two day passes. You will not cobble together enough of the alternative activities, given the distance between them, hours, and waiting and travel times, to cover the price of your tickets otherwise. Keep in mind that Kennedy's hours are 10am-4pm daily, which is only 6 hours a day in the middle of the day, and both Kennedy and Legoland are about an hour outside of Orlando in opposite directions. So, while Legoland is open from 10am to 8pm, you can't really do them both the same day with that two hour drive between. Get to Kennedy in the morning since they close early, the lines for their attractions and tours are long, and their movies and 'walking tours' are at set times. Legoland has longer hours in the evening, but it's a two hour drive between the two, so you won't make it to Legoland from Kennedy with enough time to enjoy it.
In addition to Kennedy and Legoland, we did the Wheel at Icon Park, Boggy Creek Airboat Tours, and Congo River Adventure Golf. Legoland was kind of disappointing for us, because it's aimed at elementary-school aged children and doesn't have much for teens or adults, but it's got some cool Lego sculptures and some rollercoasters. The Wheel at Icon Park was cool, and it's in the same complex as the aquarium and Madame Tussauds that are also covered under the Go Orland Pass, however, our timing didn't work out and we only got to the wheel, and then didn't want to come back and brave the lines and parking garage for the other two attractions another day (plus they are closed on Mondays and Tuesdays, which really limited the time we had available as travelers). Boggy Creek was by far our favorite. It's 40 minutes outside of Orlando, but it's worth it to see gators and waterfowl in their natural habitat in part of the Everglades. The minigolf was also cool, and they are open late, so that's a great way to cap the day for families with children of all ages.
To get a taste of the attractions around the greater Orlando area in a short time frame, the Go Orlando Pass was great. Just make sure you check to see what covered attractions are open, and what their hours and days of operations are, and the distance between them, so you can plan your trip in advance to maximize the passes.