The tour started and finished on time; we were offered, water bottle for every stop (when we got off and got on). The guide was knowledgeable and explained a lot in short span of time. Potomac river cruise was good (we grabbed lunch and get into the cruise as it had tables and chair). The tour had time to see only the backside of the white house (there is not enough time to walk to the front and get back to the group).
We walked (and for some portion rented electric scooter) to monument, World War2, Lincoln memorial, Korean war memorial, white house, etc., at night as well (to see DC in night)
For those who want to see DC on your own, you can download app (e.g., Lime) and book electric scooter (this you can pick and drop in several places) or rent bike to see the places on your own pace.