Itinerary - good order or not?

[Mandsjh]

So, only usually do disney but wanting to mix things up a bit and add some new parks on now the kids are older.

I’m thinking:

Day 1 - Arrive into Orlando late afternoon - cheapish hotel near seaworld
Day 2 - seaworld and another night in the cheapish hotel
Day 3 - universal and move to hard rock
Day 4 - 5 universal / ioa/ volcano bay
Day 6 - last day in universal with move to disney hotel
Day 7-16 disney

I’m doing it in that order as it seems silly paying a premium for a universal hotel when we can’t make use of the check in day fast pass, etc.

My questions are:

Enough time at universal - 4 days (kids will be 15&12)
Is 1 day enough at seaworld? Although a 1 day ticket doesn’t seem great value against a 14 day ticket!

[Guest]

Plan looks fine to me. I think four days is a nice amount of time at Universal. I have never been to Seaworld but I didn’t think people generally soend more than a day there.