New York City
First…it is wise to contextualize your Kili climb as an attempt…but when I tell you it’s worth muscling through all but the most debilitating/death-inducing pain/discomfort, etc., I absolutely mean it. Uhuru!
Moshi? I don’t know Moshi. I stayed in Arusha…but not really. If you’re adventurous, go on safari: the Ngorogoro Crater is spectacular and daytrips are both practical and possible…we saw 4 of the big 5 (and countless other) animals in 7 hours. Alternatively, if you’re feeling a bit beaten by the mountain, I’ve been told Zanzibar is worth a shot…though 1-2 days may make it uncomfortably rushed and prohibitively expensive.