What year are you currently? If you've still got time (ie: not applying at the end of this summer), find a weekend job at a vet. Or shadow a vet over the weekend. Or volunteer at some place with a vet. Just because you get maybe 5 hours a weekend doesn't mean its won't be helpful. From the rejection file reviews I've gotten, experience is very very important. I had about a 3.78 GPA, with a 1440 GRE, and I was still rejected from 3 schools (2 of which I wasn't even offered interviews, 1 didn't have an interview stage)).
And my experience wasn't even terrible, but it wasn't that good. I'd accumulated about 1500 hours at a vet, working just about every job (and being trained to do technician jobs) for the past 2 years at the time of my admission, and i got two LoR from vets there. I also volunteered a little (only about 50 hours) at a local 'zoo' (it was a museum with just about every type of animal there).
So saving all of your experience until the summer before really isn't that stellar of an idea. If you're bankrolled by your parents, and can work 60 hours a week with different vets (which would be almost a miracle, from what I've heard on this board), then you've got maybe 600-700 hours total. That's honestly not that much, even if you split it up into a couple of vets.
So to kinda end: do whatever you can whenever you can. Don't let your grades suffer, but you have to realize that just because you want to relax and party on the weekend (I'm definitely not accusing you of this, I myself am quite lazy on weekends if I can help it), doesn't mean you can afford to. And this also isn't to say that if you just get a ton of experience over the 1 summer, you won't get in. I still got in, and I had depth, but no breadth of experience. Just know that you won't be as competitive as others.