Osaka - Kyoto - Tateyama - Matsumoto - Kawaguchiko - Tokyo

Hello,

I plan to travel with my family (6 altogether) by April 2015.

20 April 15 : Fly to Osaka
21 April 15 : Travel to Nara + Kyoto (Plan to use Kansia True Pass / KTP day 1)
22 April 15 : Travel within Osaka (Plan to use Osaka amazing pass)
23 April 15 : Travel to Arashiyama + Kyoto (KTP day 2)
24 April 15 : Travel to Himeji + Osaka (KTP day 3), Travel to Toyama (Buy JR-Thunderbird)
25 April 15 : Tateyama Alpine Route, Travel to Matsumoto (Buy JR-Train)
26 April 15 : Travel to Kawaguchiko (Buy JR-Train to Otsuki and Fujikyu train to the destination)
27 April 15 : Fujishibazakura Festival and Kawaguchiko Lake
28 April 15 : Kawaguchiko Lake tour + Travel to Tokyo (Either bus / private + JR train)
29 April 15 : Tokyo
30 April 15 : Tokyo + Train to Narita Airport

During 24 April - 30 April 2015, Is it ok to buy individual train tickets as needed or it's worth buying JR-Pass ?

Regards,

ThePunn B.