My advice:
1. Go to the only Yosemite site run by the National Park Service for information.
http://www.nps.gov/yose/index.htm
There are tons of websites that have Yosemite in their names but there's only one run by the National Park Service. The Park Service site has information like road advice for RVs, current road conditions and weather. Other sites generally try to steer you to a particular commercial attraction.
2. Don't use a GPS to plan your route into Yosemite.
The Park Service site advises to follow the directions on the site and not to rely on a GPS. Why? A GPS will usually choose what it thinks is the most direct route as the crow flies. It doesn't take into account the hundreds of feet in elevation along a route. My Garmin had me on a road that was little more than a paved goat trail on the side of a cliff. I was scared driving my minivan. I would never want to be on that road driving an RV.
3. If you can, enter the park for the first time via the Wawona Tunnel.
When you come out of the tunnel, you'll see what's known as the Tunnel View Overlook. This view will cause your jaw to drop—guaranteed!!! There's a parking lot there that's always full of buses and people, but the view makes it all worth it. There are lots of photos of Tunnel View online but absolutely nothing can compare to seeing the real thing.
4. Stay outside the valley and take day trips into the park.
Staying in the park itself can be tricky and crowded. Campsites are tiny, stacked next to each other and are usually booked up months in advance.
5. Spend some time with a map of the park before you go.
Yosemite is a huge national park with lots to see. There's Yosemite Valley, where most people go, and there's all sorts of things outside the valley to see. Spend time on the National Park Service site to see what will be open when you plan to be there. Note that one of my favorite places, Mariposa Grove, will be closed until 2017. For info about the Mariposa Grove restoration and info about other nearby groves of giant sequoia redwoods, go to:
http://www.nps.gov/yose/planyourvisit/mariposagrove.htm
No matter how old you are, you'll feel like a tiny baby when you stand next to a tree that's a few thousand years old, and still standing and growing. Note that there are no drive-through trees. Over the years, cars got bigger and people kept expanding the holes in the trees. The trees died or fell over.
6. Enjoy the spring wildflowers.
Since you're going to be there in the spring, you'll probably be there during the time that wildflowers are in bloom. Check out this site run by a concessionaire at Yosemite:
http://www.yosemitepark.com/wildflowers.aspx
7. Learn about the history of the park before you go.
Read this article on the PBS site:
http://www.pbs.org/nationalparks/parks/yosemite/
Also, Yosemite Ranger Shelton Johnson gives great talks about the early history of the park. Call and see if he's going to be lecturing while you're there. He's been featured on Oprah and on PBS in the Ken Burns' documentary, "The National Parks, America's Best Idea." If he's not going to be in the park while you're there, you can see clips of him on the National Park Service site:
http://www.nps.gov/yose/learn/histor...falo-video.htm
8. Don't feed the animals and be aware that bears aren't stupid.
Feeding the animals (including birds), makes them forget how to get food the natural ways, and makes them dependent on people. They also lose their natural fear of people. Bears, in particular, are a problem. They can easily break into cars. According to park staff, they've figured out things like cars that have child seats visible usually have Cheerios all over the floor, so they break into those cars first. Because of their size and strength, don't do anything that will get you close to a bear. They can wipe you out with one swing of a paw. Keep food (and child seats) locked up and out of sight even if you're just parking somewhere.
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