We will be in SF for 7 full days at the end of June. Family of 5, kid ages 5, 15, 17. The older kids want to take a trip to Yosemite. We don't want to stay overnight in the vicinity of the park (hassle finding accommodations for 5), nor do we want to drive ourselves, so a day trip with one of the tour companies is our best bet. Most of the posts here recommend the smaller group tours, which I understand, but I have a practical question...with a little one along, what about potty breaks? I almost think a bus is a better option due to the on-board toilet. Does anyone have any input on this? Any recommendations on bus tour companies. Thanks!