Hi everyone.. I need some advice and you are the best ones to ask!! Everyone has such great advice on this thread!!

We are arriving in Orlando 4 days prior (Wed 4/17) till we check into the BC and plan to do other parks
Legoland, Universal etc. I have not booked my offsite hotel yet. Any suggestions???
My BIG problem is that I need a car. I dont know how I should rent it.. I also want to be able return it on Sunday 4/21 the easiest way without taking up a lot of time. (or money

) I read that Alamo/National are located right at the Dolphin. So if I rent from them somewhere offsite and drive to BC on Sunday am to drop off family to check in, do you think I can I return it to the Dolphin and walk back to BC??? Is it close enough??
My other concern is we are landing at 5pm on Wednesday night
should I pick up the car at the airport?? Or take Mears shuttle to the hotel and rent a car from there??? I bet its much cheaper as you dont have to pay that airport fee. Im so confused and not sure what to do
I priced it quick for a full size or small SUV and it was over $400.00 for 5days/ 4 night. Urgh. I really dont want to pay that.
So if anyone has any advice
that would be wonderful!!! Thanks so much!!!