Congrats on getting into vet school!
Although I am not going OOS, I went OOS of both undergrad and grad school, and was making plans for OOS vet school, so I am limited in my knowledge. I think getting there early is a wise idea: get used to the area, surroundings, roads (traffic especially!). This may cost more than what you are currently doing, but for me it definitely helped me settle. Honestly, mid–late July is pretty early IMO: I got to my place for grad school in late July and felt bored (even though I went to the AVMA convention and visited my NYC friends for a week). In other words, move early if you feel like you will be anxious and overwhelmed moving and going to orientation back-to-back, but also don't sacrifice time with family/friends just to sit around your new place (do you have roommates? Schedule move-in with them for a move-in party!)
I would highly recommend thinking about your plan for bedroom furniture, especially a mattress. I did not pre-order it to arrive the day I got there, and ended up spending $1000+ for a bed frame and mattress at a local MattressFirm because that is all that they had available (and was able to fit in my car). You may be able to ship-to-store or deliver straight to address. The "[INSERT VET SCHOOL NAME] Free & For Sale" facebook groups are immensely helpful and can be quite a bargain, so I recommend looking there for furniture, appliances, and random goodies (if you are moving from the MA area, let me know, because I have a mattress and bed frame that I have no way to get back to my IS).
Get involved in the community: go to local stores and events. You will be living there for four years, might as well have fun! And since you won't be burdened with classes yet, it is easy to go out (maybe schedule with roommates/classmates that may be in the area already?).
Also, from what people have said in other threads re: summer plans, do not try and "prep" for vet school: have fun! You got in, there is nothing else you should be doing other than relaxing before the fire hose starts (or making money if that is a priority).
Speaking of jobs, if you are considering traveling home for breaks, I would highly recommend an on-campus job. I think typically university student 'job boards' get posted in September, but doing research with uni professors could be started before than with a cold email. The benefits of an on-campus job allow you to take the school breaks without trouble when you have to call out or plan your breaks around work. I had to turn down a few jobs because they were not willing to work with me on my breaks (nor should they... they are a corporation separate from my school, they don't care lmao).
Don't worry too much: you will likely not remember moving in once classes start. You want enough time to get your bedroom furnished/decorated (neither me nor my roommates decorated when we moved in, and our walls are still bare), but not so much where you will regret coming so early. I hope this helped! Feel free to reply if you need clarification