by AlmostThere » Tue Aug 23, 2011 3:18 pm
I know it may be something you already know, but it's often overlooked - you will lose a day traveling from Yosemite to SEKI - it is a 2 hour drive downhill to Fresno, and another 1.5 - 2 hours back up into the mountains to SEKI and another 20-60 minutes to destinations within either park. By the time you are done with the driving and stopping for meals, most of the day is gone. If you have 5 days total (with one on each end for getting to and from whatever airport or other trip segments you may be planning) this will work.
There are great guides available for hiking - all of them will list trips of varying difficulties. The Moon California Hiking guide is a good general one, and then there are Sierra North and Sierra South (North has Yosemite, South has SEKI, both have also a variety of other trails available in them within the Sierra outside the parks) - look these up on google books or at the library if you don't want to buy them. Also there is yosemitehikes.com for a short menu of hikes throughout Yosemite.
You will probably want to spend one day just walking around the valley floor and up to Mirror Lake. The Panorama Trail, the Four Mile Trail, the Mist Trail, and the Upper Yosemite Falls trail all climb out of the valley floor and give great views down into it and across the mountains. Many really awesome hikes off Tioga Road, Ten Lakes pass being a really great one for mountain views. You could also easily spend an entire day touring Tuolumne Meadows - if the weather has not turned.
And on that note - you need to be prepared for snow, rain, hail and low temps. In October in the high country you will be at risk of any of those things. On a four day backpack in Mineral King I experienced all of the above plus a lightening storm. Take warm layers, rain gear, and some extra provisions and your 10 essentials - learn the symptoms of high altitude sickness, hypothermia and dehydration, and what to do about them. You may not be able to access Tioga Road that late in the year. Depends on when the snow sticks and closes the road. Many services in the park will be closed, and you will want to carry chains/cables just in case. Which some rental car places won't let you use on the car. Something to check on. You'll want them for SEKI too.