I know this has been addressed a million times on here but I did a search and couldn't find my exact answers so I apologize in advance! Plus I also know there is a thread right now addressing a similiar topic so I apologize for that too! I am really struggling with this so I just wanted some advice for our scenario! 
We have a minivan reserved for our trip starting June 1. It is $300 for the week. Mainly we wanted it for convenience. It will be DH, myself, DD6, DD4, DS3. My mom and my MIL will also be along for the trip. We are staying at Pop and other than the parks, we will need to go to Whispering Canyon and Downtown Disney. We also have a day planned for Sea World (Would we have to rent a cab?).
Is it worth the $300 for the rental? Will it be a huge hassle traveling ME with three kids 6 and under? Any advice is appreciated!

We have a minivan reserved for our trip starting June 1. It is $300 for the week. Mainly we wanted it for convenience. It will be DH, myself, DD6, DD4, DS3. My mom and my MIL will also be along for the trip. We are staying at Pop and other than the parks, we will need to go to Whispering Canyon and Downtown Disney. We also have a day planned for Sea World (Would we have to rent a cab?).
Is it worth the $300 for the rental? Will it be a huge hassle traveling ME with three kids 6 and under? Any advice is appreciated!