Personally, I'd say keep preK going FT or PT if you can. Kids LOVE structure. All the moms who are saying how happy their kids are with them FT 7 days/week everyday may be right but I'm going to tell you as a mom that has tried both ways - my 4 yr old LOVES LOVES school now in FT preK (he started at age 3). I was bored out of my mind with him at home too! You have weekends and if you did do PT, you still have a lot of free time with your kid to do whatever you want. But it'll be great for them to get that time in socializing prior to K. And no, you don't "need" socializing before K but trust me, it does not hurt and off the record, it does benefit (how can it not - think about it) the child being around other children their age playing during the day. You'd be looking for an environment like that anyway so why not just keep him in some structured care? I started because of baby #2 - and it made a big difference for all of us in the most positive way. I truly think that parents want what they want (not you per se) a lot of times. I see safe wooden toys for example that all parents just love. You know what the kids think of a lot of them? Boring as hell! Who wants to play with a toy that is solid wood that doesn't do a damn thing?

I use this story to illustrate that while some people "think" their kids may be better off with them 100% until K - you really have to look at it from a kid perspective too. They don't want to hang out with you - they want to hang out and play the hell out of their day!

I wish you good luck - I know it's not easy. My point in responding to you is that if you have not totally made up your mind to take him out of school, reconsider PT. Other than that, activity wise, you will just need to look daily for schedules in your community and online (try ourkids) for weekly activities. You'll need to pull a bit from everywhere but definitely you can find enough to occupy every day. It's just that it'll be hard with 2 kids and I'm a mom that did childcare FT and not at all and I'm going to tell you the former is a really good thing