THE COUNTRY
I've been to Cambodia three times. The first time I was there for 3 weeks and for the second time, I was there for also 3 weeks. The last time I was there, I spent close to 3.5 weeks. As you can tell, being there multiple times must mean I like the country a lot! From the beautiful waters along the coast, to jaw dropping temples, to the history the country offers, it's a no brainer why this is a popular stop for travellers exploring Southeast Asia next to Thailand, literally and figuratively.
VISA/ENTRY REQUIREMENTS
Before entering the country, make sure that your passport is valid for the next 6 months from the date of entry into Cambodia. Visa on arrival is available and the cost is $30USD which is valid for 30 days. E-visas (visa online) are available for $30 USD + $7 USD processing fee. Another thing about E-visas is that they're only accepted in Siem Reap and Phnom Penh airports. A passport sized photo is required but if you don't have one handy, it'll set you back $2 USD to get one on arrival. Tourist visas can be renewed once by leaving the country, also called a visa run then you may obtain a new one. The overstay penalty cost is $5 USD per day. You can also extend your visa in the country. If you extend your stay for one month, it will cost you $45 USD. These last three extensions are for business visas only! For 3 months - $75 USD, for 6 months - $155 USD, for 1 year - $285 USD.
CURRENCY
Riel is the currency in Cambodia although USD is widely accepted everywhere that it will feel like it is the main currency in the country. Although this is the case be sure to use the Riel as much as possible especially with smaller transactions as you will get a better rate when using the local currency.
Ensure that your notes are in good condition, no rips or tears, otherwise, they may not accept it. They can be really picky with money that's ripped. I remember having a slight rip on one of my notes as I was paying and the vendor refused to accept it. Debit/Credit cards are accepted in most places like hotels, hostels, restaurants etc. and there are ATM's practically everywhere unless you get closer to the islands where they may be limited.
TRANSPORTATION
PassApp - This is the Uber in Cambodia. You need a sim card for you to be able to use this app when you're on the go. This is a convenient hassle-free app that is also budget friendly to get around the city. Grab is another app that you may use to get around.
Tuk Tuk! - A lot of the drivers will be yelling out "tuk tuk" to you on the streets (it happened so often that I even started hearing it in my sleep.. no joke). Tuk tuk's are everywhere in Cambodia. They are convenient for getting from one place to another in a city/town. Before you get in one, be sure to bargain and always agree on a price before getting in one.
Scooter - Scooters are available for rent and they are very cheap - my preferred transportation getting around town. You can also bargain the price for rental depending on who you're renting it from.
Bicycle - The cheapest way to get around the city/town. Of course depending on how far your destination is or where you're trying to get to, within cycling distance, then this option makes sense.
Bus service/Night bus/Boat service - Probably the most common way to get around from one city to the other is to go through a travel agency in the city/town you're in and buy a ticket. There's a lot of them, hostels/hotels also sells tickets. It's safe, cheap, and surprisingly easy! Take night buses as much as possible, because it allows you to not pay for a place to stay for the night which stretches your budget even further.
THINGS TO DO
Angkor Wat and see the other temples around it such as Angkor Thom, Bayon Temple etc. (Siem Reap) - One of the most impressive temples I've ever witness. A one day pass here is more than enough and I highly recommend waking up early and catching the sunrise.
The Killing Fields (Phnom Penh) - Here you will learn about the dark history of Cambodia under the rule of the Khmer Rouge led by Pol Pot. Be prepared for a very heavy day.
Sihanoukville - Do nothing, take a dip in the water, soak in the sun and wait for an epic sunset by the water.
Koh Rong - An island known for its parties and good times.
Tonle Sap (Siem Reap) - This is the largest freshwater lake in Souteast Asia. One of the richest fishing grounds in the world. You can hop on a boat to explore the floating villages.
Koh Rong Samloem - A much more secluded and quieter island than Koh Rong. Have a secluded beach on your own and relax.
Bamboo Train (Battambang) - Located in the quiet city of Battambang is one of the coolest rides ever, not a very touristy spot but definitely worth visiting.
Pub Street (Siem Reap) - Walk around, have a cold one and enjoy the entertainment. This is a heavy tourist spot.
Bokor National Park (Kampot) - Rent out a scooter for the day and check out an abandoned casino, a view point, and the statue of the Goddess of Protector of Cambodia!
Lok Lak - A traditional Cambodian cuisine that you must try!
Cambodia offers a little bit of everything. As touristy as some spots may be, there are still places that are not over run for you to explore. And even for hot tourist spots like Angkor Wat, it's still one of the most amazing experiences you can have in this country. I hope you found these tips useful and happy exploring!