Need comment on Japan Itinerary

I will travel to Japan from 28/3 until 5/4, appreciate if anyone give some comment/suggestion on my plan:-

28/3

-30/3 Tokyo

(Stay in Shinjuku)

31/3 Yokohama

(then travel by night bus to Osaka)

1/4 Osaka

2/4 Nara + Kyoto

(Stay a night in Kyoto)

3/4 Day trip to Kobe + Himeji

(Stay in Namba, osaka)

4/4 Osaka

5/4 Leave from osaka international airport

Should I buy JR West Pass for my itinerary?

Currently, I%26#39;m still thinking of whether extend my air ticket for one more day, so that i can spend an extra day in Kyoto. Any advice??

Thanks

Jess