If i pay for 2 parks and only go to one park, Can i still use ticket for second park 7 months later?

I believe you have to use the tickets within 7 days

Yes

Yes, you could only use it one day. If you are a florida resident, check their tickets now because they have deals

I would call and ask they do have a number to ask question on their web site. It is a live person also. I was just there yesterday great time