Uruguay

Architecture: There are a lot of architectural gems in Montevideo. I enjoyed a guided tour of Palacio Salvo (cash only), a guided tour of Castillo Pittamiglio, and exploring Contemporary Art Space on my own. A tour of Palacio Legislativo is still on my wishlist.
Running along the Rambla waterfront. Run up to the Plaza del Carnaval del Uruguay for a nice view of the city.
My favourite meal was at La Fonda. Mushroom Bar is an ok vegan restaurant.
Deserts: Federación (Café y Panadería Urbana) makes spectacular pastries; at Escaramuza Libros you get to enjoy a cake in the bookshop’s inner garden.
For fresh fruit and veggies: Mercado Agrícola de Montevideo, Feria De Los Domingos (on Sundays), Feria del Parque Rodó (on Sundays). Feria de Tristán Narvaja (on Sundays) is the most fun market in Montevideo, but it’s way too crowded to attempt grocery shopping.
Devoto Fresh Market in Punta Carretas was my favourite supermarket.

Notes:

The best places to stay are Pocitos and Punta Carretas neighbourhoods; the closer to the sea the better.
The best time to visit Montevideo is on February 2nd - Día de Yemanjá (Day of the Goddess of the Sea).
I was planning to buy Antel sim card, but I never did.
You can buy a top-up card for buses, but they take cash (and give change) too.
Still on my wishlist: Museo de la Revolución Industrial, Cabo Polonio, Fundación Pablo Atchugarry sculpture park, Colonia del Sacramento.
My favourite local speciality was licor de tannat, liqueur wine made from the most mature Tannat grapes and prepared like a great vintage port.