8 月美国行程，能给点建议么？

8月份第一次去美国，3个年轻人，两个老人，两个小朋友，行程如下：

Date Activity Accomodation Transport

3-Aug Shanghai (PVG) to San Francisco (SFO) SFO Flight

3-Aug SFO city tour SFO

4-Aug SFO Friends visit SFO by car

5-Aug SFO to Los Angeles+LA city tour Los Angels trip

6-Aug 环球影城 Los Angels trip

7-Aug Los to Lasvegas Las Vegas by car

8-Aug LAS to Grand Canyon NP Grand Canyon NP by car

9-Aug Grand Canyon NP to LAS Las vegas by car

10-Aug LAS to Huston Huston Flight

11-Aug Huston Huston by car

12-Aug Huston-Washington WSH Flight

13-Aug Washinton city tour WSH by car

14-Aug Visit friend WSH by car

15-Aug Washington to 费城 to New York 费城 by car

16-Aug 费城- New york NY by car

17-Aug Newyork -boston boston by car

18-Aug boston-new york NY by car

19-Aug new york NY by car

20-Aug new youk NY by car

21-Aug Departure from new york to shanghai flight