First, either come to the park on a weekday or make peace with the fact that there will be crowds. Hell, there will still be crowds on a weekday.
Personally, I don't mind seeing a lot of people in a national park. In my opinion, there's nothing wrong with people coming out to enjoy the outdoors. Increasing the public's and younger generation's appreciation for the great outdoors is a very good thing!
But it can also be an annoying thing, if what you were expecting was some peace and quiet. You can avoid being elbowed on the trails by doing more strenuous hikes and starting earlier in the day.
Getting There
Fly into Fresno. We flew into Sacramento because it was slightly cheaper but next time I'd choose Fresno; it saves at least an hour of driving. Grab a rental car (you don't need anything rugged for Yosemite; a regular sedan will do) and stop at the Fresno REI to stock up on supplies if needed.
Camping
If you want to reserve a campground, book well in advance. Today is May 24 and August 31 is already booked in the park. If you are a procrastinator like us and didn't get a reservation, your best bet is to compete for a spot in Camp 4. Camp 4 is Yosemite's only first-come, first-serve campsite - and it is popular. People line up at 4 am in front of the Ranger's Kiosk at the campground in order to secure a spot. The time goes by quickly enough. Grab your sleeping bag and pad and nap for a few hours until the ranger comes to hand out numbers (typically between 7:30-8:30 am).
If Camp 4 doesn't work out for you, there is one last option, though it's riskier: At the Lower Pines, Upper Pines, and North Pines campground at the east side of the Valley, people no-show all the time. If a party doesn't check-in for their first evening and then they fail to check-in with the ranger by 10 am the following morning, they forfeit the rest of their reservation. Pull up to the rangers station at 10:01 am and ask if they had any last-minute cancellations or no-shows. If they do, it's yours for $26 bucks a night.
Recommended Hikes
Once you got your lodging sorted, it's time to get hiking! If you're lucky and the Tioga Road and Glacier Point Road are open, you got a lot of decisions to make.If you are in the park for only 2-3 days, pick 2 or 3 of these hikes:
Upper Yosemite Falls to Yosemite Point (9.4 miles, 2969' elevation gain). Yes, it is worth the extra mile to get to Yosemite Point - keep going! If you're a real trooper and you started your hike in the early morning, keep going to North Dome.
The Mist Trail to Vernal and Nevada Falls (7.4 miles, 2000' elevation gain). I highly recommend you go up the Mist Trail to Vernal Falls and Nevada Falls, and then come down via the John Muir Trail. Technically the JMT makes the hike longer by 1.3 miles but it is far more scenic, less crowded, and the slope is kinder on your knees.
Glacier Point to Taft Point and Sentinel Dome (as a loop 5 miles, 500' elevation gain). We didn't get to do this one because Glacier Point Road was closed the weekend we were there due to snow. I highly recommend trying to make it up at sunrise at Glacier Point, and then making the loop around. Be sure to rub it in my face how beautiful it is.
Clouds Rest (14.5 miles, 1775' elevation gain). Another hike high on my "next time list". I'm told it offers a jaw-dropping view of the Valley, Half Dome and the backcountry.
Activities
Drive the Tioga Road to Olmsted Point (and beyond!). What a beautiful scenic drive, especially if there's still snow around. I recommend going up for sunset (it takes about an hour to get to Olmsted from the Valley, so give yourself time). This got me really, really excited for some backcountry hiking next time we come to Yosemite.
Sit and watch the climbers on El Cap. There's a field between El Cap and Cathedral where you can sit and watch climbers. Binocular recommended.
Pizza Patio in Yosemite Village (formerly Curry Pizza in Curry Village). After hiking 3000 ft and 8 miles, Jeff and I happily demolished a large pizza and some beer from this park favorite.
Make friends at Camp 4. Due to our limited time, we didn't spend a lot of time at camp. I wish we had. The campground is full of interesting people - climbers, boulderers, people who can rightfully use the hashtag #vanlife, hiking enthusiasts and a bunch of other people who just love the outdoors. People bring frisbees, games, beer, guitars and firewoods. Introduce yourself to your campmates; everyone is pretty friendly.
Safety and Security
Follow carefully all instructions for securing your food from bears. You'll be given information and asked to sign a statement saying you understand your responsibilities when you arrive to the ranger's booth. Don't leave food in your car and use the bear lockers. Yosemite rangers will fine you if you do not strictly adhere to these park rules.
Drive carefully. The roads are well-maintained but they are windy mountainous roads. Yosemite can get traffic in the Valley - try not to get impatient. If you want to look at something, pull over when it's safe to do so - don't slow down and drive the people behind you insane!
Final Advice
Be nice about the crowds. Yeah, in some places there will be a lot of people. You'll see people of all abilities, competencies, and cultures in Yosemite. Some know what they are doing on a trail and others have really just no clue at all. Rather than judge or roll your eyes, try to educate! If someone looks unprepared for a hard hike, stop them and ask them how far they plan to go. If someone is being obnoxious, ask them politely if they can be quiet so others can enjoy the trail. If you see someone not using the bear lockers, scream internally and after composing yourself, inform them what they need to do. Remember, people aren't born good campers - we've all had to learn somehow!
Questions?
I'm no Yosemite expert but I'm happy to help you plan your trip if you can! Email me at yesmomimalive@gmail.com