Not sure however I thought I read a special visa for Tibet has been introduced though I wasn't advised of that a few months ago so it may not be true,. But I was advised if applying for a Chinese visa not to mention I was going to Tibet but somewhere else in China due to the sensitivity of the political situation. I think also a permit is required to visit Everest base camp in Tibet & if you are going with a tour group, they normally arrange this for you.
Bear in mind there are 2 Everest base camps, one in Nepal which is reached by foot and another in Tibet which can be reached by 4 wheeled drive/horse & cart. Obviously the latter would be easier if you'e not into long high altitude trekking.
If you look at any tour companies' Tibetan itinerary, they normally follow a fairly similar route due to the nature of the terrain & must see sights though not all go to Everest Base Camp. Snce the camp is at such a high altitude, some people decide they require a prepurchase of oxygen cylinders to be on hand should they think they might experience breathing problems etc while up there.
Here's a sample but fairly typical itinerary.
Road to Everest Base Camp on Tibetan side.
http://www.audleytravel.com/Destinations/North-Asia-and-Russia/Tibet/Places-to-Go/Everest-Base-Camp.aspx almost 8 years ago
Rent a car and just go almost 8 years agoAnswered by Fouad Fred via Ask a Nomad iPad app
For ten days, I think the best trip is:
Day 1: Arrive in Lhasa, pickup service, with tour guide
Day 2: Lhasa for acclimatization, relax (suggested sights: Norbulingka Summer Palace and Sera Monastery), with tour guide
Day 3: Lhasa (suggested sights: Potala Palace, Barkhor Circuit and Jokhang Monastery, Tsamkhung Nunnery and its teahouse), with tour guide
Day 4: Landcruiser trip: Lhasa - Yamdrok Lake - Gyantse (suggested sights: Pelkhor Choeden), with tour guide
Day 5: Landcruiser trip: Gyantse (visit Gyantse Fort) - Shigatse - Sakya Monastery, with tour guide
Day 6: Landcruiser trip: Sakya - Everest Base Camp, with tour guide
Day 7: Landcruiser trip: Everest Base Camp - Shigatse (suggested sight: Tashilunpo Monastery), with tour guide
Day 8: Landcruiser trip: Shigatse - Namtso Lake, with tour guide
Day 9: Landcruiser trip: Namtso Lake - Yangpachen Hotspring - Lhasa, with tour guide
Day 10: Lhasa, leaving Tibet by train or plane, with tour guide to send you to the airport or train station over 7 years ago