just came back from a 1-month tibet backpacking tour 3 days ago.
for 11 days, it would only be enough for u to visit lhasa & a few surrounding areas, or travel along 1 of the entry highways should u want to skip lhasa. it's prudent to allow 2-3 days for acclimatisation if u fly in, that's a gain of >3,000m in about 2 hours if flying from chengdu. Most people don’t get much problem if travel overland.
feb-mar might be too cold, apr-early nov is the better season, but jul-aug can be rainy. i would say oct is good, the sky is clearer & the leaves start to turn yellow at end of sep.
i travelled overland from chengdu to lhasa, and from lhasa-golmud-xining-chengdu on the returning route. either by public bus, hired 4wd or train, avoiding the plane as i was on a shoestring budget, & get to admire the scenery this way.
While in chengdu, u can stay at sim’s cozy guesthouse (
www.gogosc.com ), it’s run by a singaporean & japanese couple, sim & maki. Very nice place, with friendly & helpful staff, cozy & comfortable, like a home away from home.
I did not get any permit for tibet, at sim’s, I arranged with some fellow travellers from china to travel together on northern sichuan-tibet highway to cut transport cost, & also to help me register for room along the way ( when a foreigner without permit registers for a room, the hotel staff will inform the police, & he will be arrested, fined & turned back ). If u speak mandarin, u can pretend to be a chinese national, china is big, not easy for people to tell from your accent. The advice I got from fellow travellers was to tell the police I’m from shenzhen / guangdong / fujian, & just had my ic stolen.
The best scenery I got for the trip was along the sichuan-tibet highway, especially the small towns & villages. It is advisable to hire a 4wd for this route, so that u can stop for photo-taking anywhere u like. I took the public bus from town to town, so lots of opportunities were lost. The whole journey will take 10-15 days.
A 4wd from chengdu-lhasa costs rmb10,000 - rmb12,000, seat 4-5 persons ( excluding driver’s food & accom ).
If u only have time to fly in, I guess your itinerary will cover potala, jokhang, drepung, sera monasteries, not to miss namtso lake & samye monastery.
Hire a 4wd for namtso, but a cheaper option is the tour van, the one I took cost rmb1,500 for 2d1n, 9 persons sharing. It’s cold but the scenery is great. Buy more pencils / stationery / chocolate for the kids, once your vehicle stops at the ticket office, about 10 of them will run to u to ask for some goodies.
The ferry ride to samye monastery is enjoyable, slow & steady boat, scenic view along the way.
Like therat, I was a little disappointed too when I reached lhasa, the countryside is so much fascinating.
If u can squeeze in some time, try to visit the countryside / villages, they are beautiful & very tibetan.
I do not know whether what I post is of help, it seems like I’m just typing out some of my experiences.
Anyway, i’m sure u’ll enjoy your tibet trip very much like I did.