First of all: Old Faithful is NOT in Yosemite, it's in Yellowstone...Yosemite is an amazing and beautiful place. It's where nature and people can come together and for the most part live peacefully amongst each other. Black bears, deer, eagles, mountain lions, and other birds and rodents can be found at Yosemite. Squirrels are very popular. If you're looking for a bear, it's not too hard to find one. Deer are very used to humans, but you can never trust a wild animal. Respect the park's animals and you should be fine. Yosemite has some amazing waterfalls and rivers, but they are seasonal waterfalls so the best time to view Bridalveil Falls or Yosemite Falls would be in the Spring. But be very careful many people try to climb on the slippery rocks to get a closer view of the waterfalls. People have died from climbing rocks by waterfalls or from swimming in the lakes so be very cautious. If you go to Yosemite you will most likely be staying in the valley. You can see all of the outstanding rock formations from around the park. Half Dome and El Capitan are very popular The viewing spots are a good idea if you're looking for a good family picture or just an amazing picture. There are many activities in Yosemite, hiking, camping, swimming, rock climbing, rafting, skiing, horseback riding, nature watching. The tour guides are informative; they tell a lot of interesting stories. Glacier Point is a spot that everyone who goes to Yosemite should see.
Yosemite National Park is an amazing experience. Everyone should go there at least once in their life. I'm definitely going back.
Warning: If you go to Yosemite, watch out of bears and other animals that cross the roads because many bears are killed or orphaned each year. They put of signs where bears have been hit and killed by cars.