Color Factory + Museum of Ice Cream
I lucked out by having both Color Factory and the Museum of Ice Cream open up within 10 mins from my office this past year. Color Factory was the hands down favorite and I was lucky enough to visit twice. It was created by Jordan Ferney of Oh Happy Day - a blogger and party planner who created the most incredible experience inside an old SF building.
The Ice Cream Museum had a lot to live up to after the Color Factory - I would say that CF wins in my book for the overall experience but the ICM was more delicious (obvs).