For those of you who end up doing a cruise at a VP or HS/HSL/HC squadron flight time will probably be more plentiful than guys who get sent to VFA squadrons. Reason being there's a lot more room in the back of a helo or P-3 than there are in Hornets. For guys sent to P-3 or helo squadrons sometimes all you have to do is ask to go flying. I actually ended up getting to go on a sub hunting exercise with the HSL squadron I was with because I asked. I can't say I understood much at the time but it was better than any other summer job I could have been doing.
That said, don't be a tool, just like has been previously said. Hang around the squadron, play foosball in the ready room, do FOD walks and aircraft wash downs with the maintainers, ask the SDO if you can help out with anything. It can pay big dividends to not be the ghost midshipman. I cannot stress enough having a good joke ready for an AOM. You will be called on to tell one if you go.
If you're lucky enough to get sent to San Diego, enjoy Pacific Beach and the I-Bar with the other middies. See if you can get someone at the I-Bar to teach you how to play dice. Split up the cost of a rental and draw straws as to who has to be the unlucky one that drives. Guys I hung out with on my 1/c cruise were good friends to have while going through the training pipeline a year later.