Praying as it is seen is a way to connect yourself with the almighty.
Having traveled to many temples all over India I personally feel Mahakal Dham is the first on my list where you can pray at peace.
No pandas and fake priests , it is the ultimate place where you can confess, communicate, thank and protest with the one supreme diety!!
Another place you can visit when in Darjeeling is at the Sinchel Dham, and I suggest you take a trip on the chilly frosty winter mornings, its guaranteed that you will be cleansed of your sins.
In-fact never miss an opportunity to visit a temple in the hills, else you will miss a chance of getting closer to your God.