皆さん、こんにちは
テオともうしますよ。質問が一つあります。
Is there a good japanese to english travel dictionary/grammar guide? It would be really helpful if it comes in a pocket size version or something like that so that I can refer to when travelling. My primary aim is to consult it for the appropriate grammar. WaniKani has made me not really concerned about not having enough vocabulary. 
Thanks in advance everyone!
Hello! Do you mean you want to learn grammar on the go, or do you mean you want something specifically helpful for travel in Japan like a phrase book?
Learning grammar on the go lies more toward my interest I think. My vocabulary is sufficient I think but I didn’t have enough time to study grammar yet and I’m travelling to Japan in less than a month. But I would like to be able to express myself in a more complete way rather than just parroting common phrases out of respect.
I think your best bet then is the app Satori Reader and their related grammar course apps which you can get all in one sub. Because they teach grammar in context with audio and full sentences, it’s perfect for you
You have a lot of options to learn grammar there and you pick and choose any of these:
You can try the first two episodes of most stories for free to see if you like their style. Then sub for a month if you think it’s really useful. Some people use it intensively for a couple months, while others use it daily for a couple years.
You would think I work for them but I’m just very enthusiastic and started this thread here if you want to ask people questions and get other opinions, it’s very popular here: Satori Reader appreciation thread
I’m also a paper lover and would recommend a book if I knew one, but for travel and actually saying some things I think you’re going to be happiest doing something that lets you hear the sentences you want.
I like this guide, which I bought in Japan in 2020. It’s available on Amazon, but it’s kind of expensive. Amazon.com: TABITOMO Conversation with Pictures JAPAN - Japanese Study Book: 9784533083259: Kiriko Kubo; Nachie Enomoto: Libros
Basically, you have some manga, stock phrases, and vocabulary for different situations.
In truth I am a paper lover too and I would love to have a physical booklet I can carry around with me like a trusty handbook. But I guess my luggage is already pretty heavy so the application route is a more convenient choice. My grammar level right now is basically the same as having studied the first 4-5 units in Tobira Beginning Japanese I. I believe the Human Japanese course and the Satori reader is the next step so that I can hear, read and shadow the pronunciation.
I am really grateful for all your suggestions already, so I feel like sharing a nice book I read with you. I am having a really great time with the “Japanese Folktales for language learners (昔話で学ぶ日本語). It’s a collection of folktales that come with audio material so that you can read, listen to them as well as break down their syntax and meaning by having an extensive list of words at the end (kind of like Satori reader) from the few things I tried so far. It also has questions to check your understanding at the end of each story.
Are you guys also aware of any grammar bibles for Japanese? I have in mind the Grammar In Depth book from the Tobira series but if there’s anything more detailed, nuanced or with more cultural context I would be glad to read it!
Thanks again for your interest in my question, and for wishing me a nice trip. If this forum allows it, I might post pictures after I get back.
So I know of 2 good grammar references for Japanese that I like to use. Keep in mind they basically cover ALL the Japanese grammar and are not only tailored to beginners.
But both of them are references to look something up. Not mainly tailored to learn from them. I think not really useful for your 1-month goal of visiting Japan. DoBJG/DoIJG/DoAJG have some minor cultural notes in them, but both books are solely focused on showing the grammar of modern Japanese, and are not that much concerned about culture.
There are many other great books about Japanese grammar (e.g. Making Sense of Japanese: What the Textbooks Don't Tell You: Rubin, Jay: 9781568364926: Amazon.com: Books not read myself) but when it comes to grammar “bibles/references” I think the two I mentioned are hard to beat.
I personally recommend different books for different foci. A general grammar book to follow some structure in the beginning. A reference book to look up grammar points when the internet only gives unsatisfactory answers, and/or you need something authoritative. Other grammar books like the Rubin book to get new perspectives on some grammar points or focus on specific troubling grammar points (e.g. particles). Some workbooks/drill books to get used to the most common grammar points and “make them your own”.
Or naturally, digital equivalents if you prefer (Bunpro, Irodori and all the others)
But honestly like @SarahSh recommended, for a trip in the short term, a phrasebook or similar will probably make the biggest difference.
Thank you everyone for your awesome suggestions, I’ll be checking all of them out! This was my first time asking a question in this forum and I’m really happy about your support!
It’s a friendly place 
see you around and enjoy your trip!
