Early April is early season. It's possible that there will be quite a bit of snow at the higher elevations. And Yosemite is a valley. All the trails go up out of the valley to higher elevations.
Any backpacking requires a Wilderness permit. You can get them before hand online at
Yosemite Wilderness Permit info. However you can usually have pretty good luck getting walk-in ( as compared to pre-reserved ) wilderness permits in the valley on the day of or the day before you want to enter the wilderness. Get there early and be flexible in your plans in case you don't get your first choice. Each of the trailheads has a pretty small number of pre-reserved and walk-in permits allocated. The popular trailheads fill up very quick. This is one place where early April helps you. You'll have an easier time with crowds, getting permits, getting campgrounds.
Even with the permit you're restricted where you can camp. First off you have a minimum distance from the trailhead before you can set up camp. And then there are some no-camping zones. I can't find a map online, and I'm not sure how to describe the rules. I'm hoping others will have more to say.
Once you get a Wilderness permit you're allowed to stay at the Wilderness Permit campground the day before and the day after you enter the Wilderness.
If you don't have a reservation for a spot in one of the car camping campgrounds ( Upper Pine, Lower Pine, North Pine ) there are only two choices.
1) campground cancellations - I've never done this, but this is how I think they handle no-shows for the car campground sites. They wait for the people to show up at the camp site. When they DON'T show up, they give the empty sites out to people on the waiting list. To get on the waiting list you go to the campground office which is in a back corner of one of the parking lots. There's always more people on the waiting list then camp spots, so to be fair they randomly pick people on the list. ** someone please correct me on the details of how this works **
2) camp 4 walk-in campground - There is ONE non reserved, first-come-first-served campground in the valley, Camp 4. This is a shared camp site campground. They fit up to 6 people per site meaning you're sharing the bear box, picnic table, and space with others. It's also 'walk-in' meaning you park you car and you have to carry everything you need to the site. This can be anywhere from 100 to 400 feet away( or farther when the main parking lot fills up ). Every morning they know how many people are leaving. This many people in the front of the line at the kiosk get into the campground. So it's important to get to the kiosk early and be in the front of the line. Camp 4 has a very different feel from the Pines car camprounds. It's largely students, foreign tourists, and rock climbers. You get to meet and interact with some interesting people.
*BEARS* *BEARS* *BEARS*
this can NOT be OVER emphasized
be bear aware
bear proof your car, your tent, your backpack, your hippack, your campsite, your . . . .
ANY food, ANYthing with a scent, canned food, toothpaste, deodorant, perfume, bug spray
anything the bears associate with food, ice chests, backpacks, hip packs, bottles of anything even non-food ( i've seen bear teeth marks in hair product bottles, they'll bite things to see what's in them )
it all has to go in the bear box or bear canister.
any time you get back to camp and put things away, anytime you leave your camp, your car, your whatever, check everything and make sure you didn't forget about that granola bar! ( surgically precise slice made by a bear claw in the corner of the tent where the hip pack was that had a forgotten granola bar )
When I leave a car I like to clean it out so that there's no clutter in the car. Maybe I'm wrong, but I have to wonder sometimes if they see a bunch of junk in a car they don't break in just to see what it all is.
Don't leave the bear box open any longer then is needed. Open it, get what you need, close it. If you have your back to the bear box and are doing something like fixing or eating dinner they will sometimes will sneak in and grab something from an open bear box. In general, keep everything within arms reach.
Make sure the latch is snapped shut on the box. They've learned how to open shut, but not latched boxes.
There are bear boxes at all the campgrounds and at the trailhead parking lot. Use them, don't leave caned food in the car! The bear boxes at the trailhead are communal bear boxes, they're shared by everyone, don't put a lock on a bear box.
Don't hang your food, you'll lose the food and might get a ticket from a ranger.
Don't go backpacking without a bear canister, you'll lose the food and might get a ticket from a ranger.
You can rent a bear canister for $5 when you get the wilderness permit.
With all this said, worry about the bears and your food, but not yourself. They're generally scardy cats and you are in little danger. You have more to worry about from the deer than the bears when it comes to injury.
With the snow this year, and it being early April, you may be better off just staying in the valley and doing day hikes.
How comfortable are you with camping in snow? This is the hikes off the valley floor. Snow shouldn't be a problem in the valley.
How much hiking at altitude ( 5 to 8 thousand feet ) have you done? First time visits to altitude can sometimes have unexpected results.
If you are determined to overnight backpack my suggestion would be to go up John Muir Trail ( JMT ) to Little Yosemite Valley ( LYV ). This will take you past Vernal and Nevada Falls. This is probably the easiest of the choices out of the valley ( not easy, just easiest ). There is no camping between Yosemite valley and LYV, you must make it up to LYV. From LYV you could try some day hikes in the area.
Ok people on the board, pick this apart, where am I being reactionary? wrong? what new info have you to say?
Backpacker87, have a safe and fun trip. It's pretty hard not to have a good trip when it's to Yosemite.