Sounds like a good time to me. It hear the perch bite is picking up a bit again out there. They walleye has been some of the best fishing in years.
Where are you planning on camping/fishing out of?
I haven't seen people get as seasick out on Erie... Not saying it can't happen, i just haven't seen it happen as much as I have on boats out on the gulf, etc... I don't know, but suspect that maybe setting in the bottom of the boat playing on an ipad may setup someone to potentially get seasick as opposed to looking out over the edge of the boat. If he gets bored perch fishing put a casting harness and a nightcrawler on for him and let him practice casting and reeling back in (constant casting action always entertained me as a kid). That should keep him entertained and there is always a good chance he could hook a big sheephead for a good tussle, or maybe even a walleye depending where your at.
As hot as it's been lately I think it's always wise to stay hydrated. Snacks are always good to bring along with kids while fishing... Heck who am i kidding I like snacks too.
As of now it looks pretty windy on friday and saturday... I hope that changes for you, I know it's a bit early to tell just yet.