From your hotel to Deshengmen:
Take subway at Dawanglu station, alight at Jianguomen and change to line2 to Jishuitan. Then you can walk to Deshengmen or Deshengmen xi.

Two ways to Ming Tomb:
1. Take bus 345 (快), 919 (支) No.1 at De Sheng Men Xi Station, get off at Chang Ping Dong Guan Station, and take bus 314, Changping 23 to Ming Dingling Tomb Station or Changling Tomb Station.
2. Take Subway Line 5 to Tiantongyuan Bei, get off the subway station and shift to bus Changping 23 to Ming Zhaoling.

From your hotel to Tiantongyuan Bei:
Take subway at Dawanglu station, alight at Dongdan and then change to subway line 5 to Tiantongyuan Bei.

Thank you Mr.Justin. Is there any bus stop near hotel? A friend told me there is a bus stop names 郎家园, that nearer than dawanglu subway station. Is it true?

Please give me advice also, which bus I must take to go to Bird's Nest and water Cube from Ming's Tomb (Dingling)? Thank you.