Big Bus Tours
This is another hop-on hop-off tour where you can get on the upper deck of an open-top bus. The bus has live commentary as well as personal recorded commentary. You purchase a ticket that is valid for the full day with unlimited re-boarding on their loops. The Red and Blue loops stop at the Lincoln Memorial. They run a night tour as well very similar to the Trolley Tours. For more details, visit bigbustours.com/washington
DC by Foot
This is a tour service where there are no upfront costs. You can pay the licensed guide at the end of the tour depending on what you feel the tour was worth and based on your budget. The tour options include food, bike, bus and photography tours. For more details, visit freetoursbyfoot.com/washington-dc-tours
This is the most unusual of the ones mentioned here as the vehicle you travel in is a ‘Duck’. The tour is amphibious, which means that the it is on land and in water. The tour has a ‘Captain’ on board who provides live commentary. For more details, visit dcducks.com
All of these tours can be booked online, and a pickup can be arranged from your hotel.