We have a family trip coming up in May. There are four adults and three children (7,5,1) in my group. We will be staying in Georgetown, not so close to metro. I think taxi will be a better option for us to visit the attractions on the mall. What is the best way to get a taxi that can accommodate all of us? Is taking two taxi cars our only option? Are there taxis equipped with car seats (mainly for the 18 month old)? Thanks in advance.