Another different feature for us was being on a warm beach in the middle of December!
Miraflores is perhaps the perfect place to check the coast in Lima, as it is a quite trendy and safe neighborhood. Actually it was there where we stayed, first on a hostel with the weird but cool name of "Red Psycho Llama"; and then on an Airbnb house that we've shared with a talkative Dutch and an easy-going Peruvian.
Other building of note was the Casa de Correos y Telegrafos, the central post office of the capital. It was from there we took the opportunity to send some gifts home so they would arrive in time for Christmas.
Most of this part of the city we did it on a Free Walking Tour. We always look for those because they get you to the most important sights in a few hours and generally you get to know not only some historic facts but also more about the local culture and curiosities. Although they are free tours, in the end the guide(s) usually gets a tip.
We visited also the beautiful Barrancos neighbourhood, went to the beach to send our friends a Christmas card (!!!) and visited the MATE museum, Museum of Mario Testino, a famous peruvean photographer. It was worth the visit!