Heading east, India could be a possibility, although it’s not for the faint of heart. As a resident of Singapore, I assume you know a fair bit about India. Outside of Mumbai, it’s all quite cheap and the weather will at least be good. Personally, I love the southern state of Goa, and it has everything you are looking for, without the insanely crowded conditions of India’s big cities.
Say Hydrated – This is a no-brainer and one of the most significant challenges for me. I never drink enough water, but it was hot this week in Florida when we were at Disney, and I could tell such a difference in how I felt when I was hydrated. I felt like it made it easier to stay strong and stick to eating low carb/keto as it helps to quench false hunger.
Cancun is at the north end of the Riviera Maya, which also includes the island of Cozumel, so this is a huge area with over a thousand hotels to choose from. All that competition keeps prices down until the high season begins, so November is still a buyer's market. There are even ruins nearby and other cultural opportunities, so it's not all about sitting on the beach here. If you prefer a high-rise hotel overlooking a beach then stay in Cancun itself, but if you prefer to stay in a friendly town with many restaurant and shopping choices then head to Playa del Carmen, just a bit to the south, instead.
Say Hydrated – This is a no-brainer and one of the most significant challenges for me. I never drink enough water, but it was hot this week in Florida when we were at Disney, and I could tell such a difference in how I felt when I was hydrated. I felt like it made it easier to stay strong and stick to eating low carb/keto as it helps to quench false hunger. 

As for your Europe trip, I highly recommend spending 3 nights in any city you visit. If you change cities every day or every other day you’ll end up spending most of your holiday on trains or in airports rather than seeing the places you flew all that way to see. So if Amsterdam and Barcelona are musts, I would add exactly one other city if you’ve only got 9 days. Unfortunately it’s not on your list, but the best and easiest one to add between them is Paris. There is a train from Amsterdam to Paris in a bit over 3 hours, and another high-speed train to Barcelona from Paris in 6 hours 27 minutes with no changes. Paris is easily one of the most impressive European cities for tourists, but if you’ve been there before and don’t want to go again you can obviously choose something else.
Weirdly enough, Central America and South America aren’t really known as top “culture” destinations, as the colonial history has mostly wiped out the indigenous history in the larger places. There are Aztec, Maya, and Inca ruins and sights, but not really enough to build a whole trip around. I’d say the most interest of those would be the Inca culture of Peru, specifically around Machu Picchu and the valley around Cusco. Alternatively, visiting Argentina is pretty much like visiting Europe from a culture standpoint. It’s quite nice there and prices are low if you know about the blue market for currency, but otherwise it may not be what you are looking for.
If you’re a bit more on the timid side, you can always use Yelp and TripAdvisor to get good insights on places people have visited. As a disclaimer, some of the ratings may not be accurate on these sites, so make sure you go through and read some of the more recent reviews that people have written. We did this for a few of the places we visited and had no issues.
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