Gubei Water Town and Great Wall

We found that it is a Tourist bus from Dongzhimen in Beijing to Gubei Water Town:
o Departures: 08am/09am/11am/12am/15.30pm
o Price (per person): CNY48 per person, one-way, tickets released 30 minutes before departure.
o 2 hours trip
Is it true?
Also, we are sleeping in Gubei Water Town, we need to reserve tickets for the great wall? We will be visiting by night upon arrival and during the day the next day in the morning.
As we understand we need to pay CNY150 per person to get in Gubei Water Town plus the hotel, cable car trip to the Great Wall and Great Wall entrance, correct?