Happy planning! So exciting!
For the older girls, Uber/Lyft or Minnievans (although I think they're more expensive), or something we've done is just do a pickup at a park or nearby resort. The parks all have pickup lanes and it is pretty easy to navigate to a pickup area (generally the same area that Uber/Lyft use). They don't charge a parking charge if you're just driving through to pick people up.
Don't forget to plan some downtime to hang out at the resort. The pools are awesome, and there are a couple of game rooms, pool, ping pong, mini golf, etc. Go to the activities desk to check out pool towels for your crew. Also grab an activities schedule from them as well. Your younger kids might like feeding the fish in the lake, you can buy a baggie of food at the activities desk. Actually, it is fun and relaxing for any age, DH and I love feeding them