I am traveling alone to Parmarth Niketan (Haridwar) and want to know the best -and safest- way to get from Delhi to Rishikesh?
anyone going that way around the 18th of April?


you should probably be fine taking the train from Delhi to Haridwar, and then a short bus or taxi ride over to Rishikesh. there are several trains that arrive in Haridwar in the morning or afternoon, and the train is only a few hours so no overnight journeys to worry about. the Dehra Dun Shatabdi leaves around 7AM and arrives around noon -- there are Chair Car seats available for that date around now, according to the india rail website.
i wouldn't worry about your safety travelling alone on that route -- if you want a companion, well so be it, but i can't imagine that a train trip of a few hours on one of the more exclusive indian trains, during daylight, would be unsafe.