I only have one minute? Oh, dear.
I'll take my favourites, then. One, for me, is walking on the ocean floor. It's a rare opportunity that we have to be 53 feet below sea level. You do not need scuba gear for this. The tides recede—and where I live, they actually go out five kilometres—and fully expose the ocean floor, with the ecology that ensues. This can be done for free; it can be done by children. It's one of the most extraordinary things you can expose your children to at a young age, to be able to see nature in its entirety in that regard. It's a rare opportunity.
I guess my second favourite thing to do would be sea-kayaking at high tide over the same spot where I was just walking on the ocean floor.
Those would be my top two.