First, here are your minimum insurance requirements:
Required Minimum Bodily Injury Coverage
$15,000 per person injured in any one accident and $30,000 for all persons injured in any one accident
Required Minimum Property Damage Coverage
$10,000 for injury to or destruction of property of others in any one accident
Second: most polocies run for 6 months at a time. So you might need to cover for 6 months to have the coverage for the 2 months that you need it.
Third: Don't drop your insurance. It seems to make sense because you are not driving. The problem is that most insurance underwriting departments look for lapses in coverage as an indicator of a higher risk profile. Hence, you will end up losing money in the long run.
Fourth: Comprehensive insurance is the SAME as vandalism insurance (at least in 99.9% of cases involving auto insurance from an auto insurance carrier). You do not have to buy this insurance. Comprehensive insurance is less expensive, if you can buy it seperately, than collision insurance. If you can't buy it seperately (and you really want to be covered for vandalism) just put a huge deductable on the collision and a normal deductable (250 - 1000$) on the comprehensive.
Overall, I would recomend that you just put the minimum liability coverage on the vehicle. That way, if someone hapens to borrow the car, you are covered. I have worked in insurance and it is amazing how many borrowed cars get in accidents. Even if you do not give permission for a friend or family member to use the vehicle, it is considered premissive use unless you are willing to file theft charges against the friend or family.
How is that for long winded?