You are welcomed anytime to ask any question, what didox said is true about the metero and taking a taxi afterwords to the end of AlHaram street(the Giza pyramids are located at the end of that street. please take a look at this site i found having the map of metro lines in cairo and giza also print it and bring it with you as it may be of a great help: http://www.urbanrail.net/af/cairo.htm.
Note that the Giza station that you should leave(Metro line 2) is located on the map by Giza Railway, and Dawahi giza station is Giza Suburbs.
The cost of a taxi from Giza to AlHaram would be about 10 egyptian pounds($1.7), but take care that most taxi drives in Egypt charge tourists double or even triple the actual price.
About combinning a visit to both the Giza pyramids and Dahshur's in one day is a little bit hard, unless you want to visit the Giza pyramids for about 1 hour(max). Because Dahshur's pyramid is located in a very different area than the Giza pyramids and also because of the traffic, you may take about one and a half hour trying to go from the the Giza pyramids to Dahshur's on a normal traffic day.
There are 2 routes to get to Dahshur pyramids, the first one is taking Sakarra road, about10km south of Saqqara(passing by sakkara pyramid,ie. step pyramid). The other road is Upper Cairo- Upper Egypt road(by taking first the ring road). Either ways i suggest that you take with you a tour opperator so that don't get lost.
Check this site about the current taxi cabs in Egypt http://www.touregypt.net/magazine/mag04012001/magf3.htm.
Starting from January a new organized Taxi system will operate in cairo, like New York's(Yellow cabs).
A huge thanks to didox and Reham for the information. As usual, the questions never stop for me. I have a few more.
1) I have heard the residential suburbs of Ma'adi and Heliopolis are pretty nice. What are the nearest metro stops to these places?
2) Is the Cairo Tower open as late as 11:00 p.m.? I realize it is on Gezira Island but is it walkable from Midan Tahrir?
3) As far as things I plan to visit in Cairo, here is my list:
Egyptian Antiquities Museum
Am I missing anything? I would appreciate it if you could let me know.
Once again, thank you very much for all the responses.
You are welcomed, as you said the suburbs of Ma'adi and Heliopolis are very nice areas to live in. Ma'adi suburb is divided into 2 parts Old Ma'adi in which old beautful houses and villas are located and there is new Ma'adi where there are lots of high buildings and appartments. (from the name old maadi was built early in the 20th century where rich and upper class people used to live there back at the good days, while the new i guess was and is still expanding since the 1960's). Lots of Ma'adi residents are forign residents who live and work in Cairo.
Heliopolis also is very beautiful as it is very old and have lots and lots villas, the suburb was founded by Baron Empain a Belgain adventurer and business tycoon in 1907. One of the most distinguished places in Heliopolis is his fascinating palace(you will be able to see it on your way from the airport to downtown, it will be on your left side). look at this link: http://www.touregypt.net/featurestories/baronspalace.htm
The nearest metro stops according to the map: unfourtunalty there is no metro line to and from heliopolis right now but it is planned to be constructed soon(Line 3 in the map the green line). As for Ma'adi it will be line 1(but i don't know exactly what station, you will have to ask then).
The Cairo tower is located on the Gizera island(Known as Zamalek suburb), yes it is walkable from the Tahrir square about 45 min. you will have to walk till you reach the Kasr El Nil bridge(bridge having 2 pairs of a huge lion statue on the 4 sides), cross it, then you will be faced by a square, take the street on your right hand, walk till you see a samll street perpendicular to the main street on your left side, walk that street till the end you will be faced by the tower(i guess you may have to take a taxi because it is a little bit confusing).
About missing anything else, i guess you are missing a lot, cairo is full of many intresting areas infact it is an open museum, old cairo for example is full of maney historical places one of them is the Citadel, others are mosques (like Amr EbnElaas Mosque), Churches(Hanging church, and nearby churches + coptic museum), and there is the Jewish synagoge(the mosque, the church, and the synagogue are in the same area).
Also there is the Al Azhar mosque built in 970 AD, you can visit it while you are visiting the Khan-el-Khalili Market(located in the same area).
Also dont forget to take a Cruise in the Nile both at night or day, it is vey nice, but during the day is better to be able to have a great look view.
below is a site having famous visiting sites in egypt including Cairo
Thats it for now i hope that i did't confuse you with all these places.
the cairo tower is open from 9 morning till 1 next morning ..(9:00 am to 1:00 am)
2.Oh, make sure you know what 356 looks like in arabic--though someone will probably be able to help if you ask.
In arab bus 356: ٣٥٦
It is better to hire a Taxi in Cairo. For a whole day's hiring, it is about 200EP.