Tanzania - Rwanda - desperate solo traveler -help!

I am planning on traveling Tanzania - Rwanda from October 13 - November 13.
fly in Dar and take a bus to either Arusah or Moshi/ Kili trekking/Serengeti - Ngorongoro safari

Move to Kigali overland (through Mwanza)/Gorilla Tracking

back to Tanzania overland (i am not which route I will take since i will have doen the Mwanza route, I want to try other one, any recommendation??)

from Dar, take a ferry to Zanzibar and spend couple of days there.

QUESTIONS
1. for 5 weeks, does my trip plan sound doable or reasonable?

2. i am going to Rwanda mainly because of the mountain gorilla tracking. How many days should I spend in Rwanda, considering I have 5 weeks in total for Tanzania and Rwanda?

3. any other places to recommend in Tanzania and Rwanda? any reasonalbe operators for kili trekking/safari?

4. is there direct flight from Kigali to Dar/Zanzibar, if so, how much it would cost around early November??

5. """Is it really MENDATORY to have yellow fever vaccionation certificate. it is 130 dollars for vaccination and I do not want to do it if possible. I will cross the border overland. Do you think I will have a problem??"""

6. In tanzania, do i really need to take malaria pills. is there any place that I can get cheap malaria pills?

7. is there anyone who did bike tour in Tanzania (around ngorongoro/serengiti..or any other game parks?

My answers are below... I have a friend/guide based in Arusha who could go with you if you wanted to hire a guide...

1. Totally reasonable... I was going to do this in about 10-14 days but I have been to Tanzania twice & have seen most of the sites in Tanzania....

2. I suggest 1 week in Rwanda...Gorilla treking is expensive (as I am sure you know) and I have never heard of anyone going gorilla trekking for more than 4 days... Most people go for 1-2 days... I think 2 days is the best because its Possible you won't see anything if you just go once...

3. There are lots of places to see in Tanzania... In Rwanda, you would probably want to see some of the genocide memorials...

4. There are cheap airlines in East Africa such as Precision Air & others.... I know some of them go to Kigali... You will just have to google it because I don't remember which ones go there...

5. I would get a yellow fever certificate... I have been to Africa several times and haven't ever been asked to show mine but it would be a real bummer to get someone who insists on seeing it.... The $130 or whatever is cheaper than getting there and having to go home because you don't have it...

6. YES, you have to take malaria pills in this part of the country but ONLY IF you don't want to get Malaria! Most people who grew up & live there actually do get malaria...

7. I don't remember seeing any bikes in the national parks... Pretty sure they are not allowed as it would disturb the wildlife....

Cheers,
Renee

i flew into kili airport 2 years ago and im sure i had to show my yellow fever stamp. yes its expensive but you wont have to spend any more time worrying about it once you have it - unlike if you dont get it.

i didnt see anyone do any bike tous either.

have an awesome time - i'd love too see the gorilla's - amazing!

thank you both for the useful info. yes, i guess i'd better get the shot..better spend some money than feel sorry..

yes, i am looking forward to my trip. first time to sub-saharan africa!