For RailFans, Platform Announcements are more musical than Bollywood songs. - Prince Maan

Thanks for the suggestion Sir.
This is what I have planned till now (Though thinking to remove Haridwar or Lucknow from my list)
Board 12687 Chennai Dehradun Express on 26th May at 9:45 AM
Class-2AC
Fare-...
more...

Rs. 2052
Current Status-WL 3/Wl 15
Will reach Dehradun on 28th May morning at 5:00 hours
Visit FOREST RESEARCH INSTITUTE, ROBBER’S CAVE, TAPOVAN, TAPKESHWAR TEMPLE, DAKPATHAR, Tara statue and stupas, for the next two days.
For details, refer:
eholidayindia.com/india_at_glance/Dehradoon_sightseeing.html
en.wikipedia.org/wiki/Dehradun
dehradun.nic.in/tourist.htm
Move to Mussorrie via road on 30th May and stay there for 3 days. Stay there till 2nd June morning.
Visit
en.wikipedia.org/wiki/Mussoorie
dehradun.nic.in/tourist.htm
Come back to Dehradun on 2nd June and take 19020 Dehradun Express (Dehradun-Haridwar) at 10:40 hours
Class-2AC
Fare-Rs. 279
Current Status-Available 6
Will reach Haridwar on the same day at 12:25 pm. (Avg 15m Late)
Visit CHANDI DEVI, BHARAT MATA TEMPLE, SHANTI KUNJ, HAR-KI-PAURI , MAYA DEVI TEMPLE,
For details, refer:
eholidayindia.com/india_at_glance/Haridwar_sightseeing.html
en.wikipedia.org/wiki/Haridwar
Take 13010 Doon Express on 5th June from Haridwar (departure time: 22:15 – Avg 7 mins Late and arrive Lucknow at 8:15 hours on 6th June – Average 2 hours 37 mins late).
Class-2AC
Fare-Rs. 772
Current Status-
Refer:
wikipedia.org/wiki/Lucknow
eholidayindia.com/india_at_glance/Lucknow%20_sightseeing.html
Take 13239 Patna Mathura Express on 8th June (departure time: 23:55 hours – Avg 15 mins Late and arrive Agra at 5:45 hours on 9th June – Average 1 hours 40 mins late).
Class-2AC
Fare-Rs. 574
Current Status-
Refer:
eholidayindia.com/india_at_glance/agra_sightseeing.html
en.wikipedia.org/wiki/Agra