I am sorry - There is a Mix up, I asked the question.
The river cruise we went on included a rickshaw ride through Chinatown with a meal and pick up and drop off at hotel ask at desk
you can (should) tie up UBER or a call cab to schedule your pickup
They don't pick up from hotels, but the area is very easy to get to.
We were staying at Swiss Stamford which was about three blocks to the river so we just walked to the ticket kiosk. If you are at Marina bay sands the boat stops there as well. To be honest the only cheap thing in SIngapore are cabs so just grab a cab - if you are 20 mins from the boat it will only cost about 10-15 singapore dollars
Some hotels have tour services that might include the river cruise as part of the itinerary. Check with the front desk at your hotel about such packages.
Get quick answers from Singapore River Cruise staff and past visitors.