In law issue

My in-laws are amazing. They only want to help, have given us so much and are so kind. My mother in law just overwhelms me.

They used to live 30 min away from us, but they retired and moved 5 hours away to a different state ( prior to us having kids). They have kept all their doctors here in NY, so every time they have any doctor, routine or serious, they travel minimum 5 hours for the appt and stay with us for AT LEAST 3 days. Doesn't seem like a big deal but when they visit for a dentist appt ( with several follow up appts) podiatrist, cardiologist (with multiple appts for testing, and now a surgical procedure with recovery time ) etc, it gets to be pretty frequent. I'm not sure if I'd feel differently if me or my mother in law were different people, but I'm an introvert and need my quiet time. I get drained by social interaction.  My mother in law is the complete opposite. She is an extrovert that literally never stops talking. I know it's probably because no one else really listens actively to her since she can literally talk to a wall. The visits have been too much. There's nothing I can do about the visits. They see their doctors here and obviously it's not right to say they can't stay here. And they won't stay with their other son who's local because of a strained relationship with their other daughter in law. I just feel like we're taken advantage of because of convenience and it's an excuse to see their granddaughter.  But then I feel they shouldn't have moved. But again, not my place  to have an opinion. Just venting about that and interested in hearing your opinion if I'm crazy for feeling this way.

The real reason I'm posting is I want to ask how to approach this. I'm currently pregnant. Due may 14th and my daughter will be 23 months when the baby is born. My in laws just mentioned wanting to pick me and my kids up this summer  ( driving 5 hours no traffic to pick us up, and driving 5 hours minimum no traffic with a newborn and toddler ) to stay a week, and my husband would come the weekend, stay a day or 2 and then me and the kids would drive back home with my husband

. I don't want to stay a week with my in laws without (or WITH) my husband , because I'll be exhausted with a newborn EBF and a toddler. Of course they would help, but that's not the point. I hated socializing with my first and know I just want to be home , comfortable with my 2 kids, quiet.  Plus who wants to travel with a new born??? No matter the reasoning. I don't want to do it. They mean well but no thank you. How do I turn them down?