If I purchase the tickets for multiple attractions (Sealife, wax museum, Orlando eye, and legoland) are the tickets only good for the same day?

No you can do them all on seperate days! I hot the package, it was great fun!

I'm not sure which package you are referring to. I've had the one i purchased from Costco, the package was in the form of a go City card, which included 4 attractions out of 18. If that's the one you are referring to, then you can use them on multiple days, up to 31 days between your first and last attraction, if I'm not mistaken (read the fine prints).

It should be written on your tickets

We used ours on multiple days