It's a big deal to take a vacation with an s/o. You learn a lot about one another, maybe even too much, and it can either make or break your relationship. But from my most recent experience, I've been able to strengthen my relationship and here's how:
First of all, make sure you're able to keep the conversation going with your special someone. If you both have a hard time striking up a topic to talk about, you may be facing future issues that will venture beyond just vacation survival tips. During vacation, a huge part of the time is travel. Whether you're in a car, a plane, or just waiting in line, you're going to have a lot of alone time to chit chat so enjoy yourselves and continue to learn from each other. It doesn't matter if you've been together for 3 months or 3 years. Your partner will always have something new to teach you.
Secondly, I would strongly suggest agreeing on taking pictures of your vacay only at certain parts of the day. Most partners I've met hate having to take 1,000 pictures for hours and hours and it can drain your partner and take away quality time of the vacation. Communicate and agree on when it's okay to take pictures for social media and when it's time to just enjoy the moment. Guidelines like these are so helpful when you're planning on spending a period time with someone you care about.
Lastly, be prepared to not always get along. Vacations can be stressful at times. You may get lost, the weather may get worse, or you might be feeling a little tired and that can sometimes project some frustration on to your partner. It's okay to be a little agitated at times. It's normal when you spend intimate time with the same person for a long period of time. But you need to make sure you communicate your frustration with your partner so that way both of you understand how the other is feeling and can be conscious of what can help or hurt the problem.
It's a major step in a relationship to go on a big vacation. It's scary and exciting, but it does require trust and communication. Just like any good relationship. So enjoy your trip, enjoy each other, and start exploring!