If you still want an opinion from someone who has been living in Bali since before the rabies outbreak, I have not had any vaccines, but do have good medical travel insurance. For me the important vaccines are tetanus and hepatitis.

More to the point - you definitely don't want to get yellow fever. You may not need the certificate and will not be asked for it if you are arriving from Canada, however yellow fever is present is is not good news if you get it.

The easiest way is to receive your vaccination at the Bogota airport or in Santa Marta.

Yes it's easy, however you will then have to wait ten days before travelling to any area where the disease may be encountered. Get the vaccination before you travel.

It might be a problem. I flew last Feb to Maputo, Mozambique with a stopover in Addis Abeba. It was only three hours but it didn't matter. We had to take YF vaccine at Maputo airport only because we arrived on a flight from Ethiopia.
I'd think though that in your case the Certificate of Exemption should be respected.

The yellow fever vaccination is now good for life.

Yes... and No...

The vaccination is now viewed as adequate for life (except for a few people with high exposure risk). However.... not all countries have yet committed to accepting this. Good advice to carry a printout of the CDC notes, and it's relatively unlikely that OP will end up running into problems, however the decision to get a booster in Quito makes sense. Perú is not going to want a certificate in all probability; the first place where they may want to see one is Bolivia, by which time 10 days will presumably have elapsed.

Yes VOA available. As for the Yellow Fever question there are as many opinions as passengers. From what I have read significant sections of Eastern Tanzania and Zanzibar Island are Yellow Fever exempt. However, and its a big however, if you arrive from or have transited a Yellow Fever country/city then you may be asked to provide a copy of your YF vaccination certificate. Transiting Nairobi or Addis Abba often atracks attention even if you never leave the airport.. Cheers

Australia and UK have recipricol agreememt for health - try going to a hospital out patients and see if you csn get thete - should be free or just the price of vaccine.

I am an older person. A YF injection is medically dangerous for someone older than 60. I do not leave for Tanzania until Feb 15. I'll let you know what happens.

I think that is an exaggeration, the rate of side effects in over 60s is three or four times that of under 60s but they are both minuscule, for example, if 0.4 in 100,000 under 60s and 1.2 to 1.5 in 100,000 over 60s get life threatening side effects from the vaccine I would not call either medically dangerous compared to actually getting yellow fever.
https://www.newscientist.com/article/2190439-what-are-the-risks-of-dying-from-having-the-yellow-fever-vaccine/

First of all it is a decision only you can make. I can only tell you that I did not take antimalarials. On this map it says malaria is "low to no risk" and "antimalarials not usually advised":
https://www.fitfortravel.nhs.uk/destinations/south-america-antarctica/colombia/colombia-malaria-map

When we went to Tayrona there was a recommendation on the park website to get vaccinated against yellow fever but it was not mandatory (and that is still the same today). We did not get vaccinated. You can try to avoid mosquito bites by using DEET and wearing long-sleeved pants and shirts, especially at dawn and dusk. But, again, it is a decision only you can make.

By the way, I still recommend staying overnight at Tayrona! I edited my reply to your other question as I found out about two other hotels in Tayrona.