End ileostomy advice

I've only had a temp loop ileostomy but stoma care should be the same. What kind of appliance are you using? I used to wear a two piece appliance and I loved to remove the bag portion and leave the wafer attached to my skin and shower to clean the stoma. Mild soap always worked fine for me and a gentle cleaning with a soft cloth if needed. On bag change days I always did it in the morning and removed the entire appliance and took a nice long shower and got the skin and stoma area nice and clean. When I emptied my bag at home especially, I would pour some water into the bag and swish it around a bit, especially up around the stoma to help wash out as much as possible.

I agree with keeping things simple - the less products you use the quicker & easier a change is!
I change my bag every time I shower (so every day or two) - I don't think most people on here do this but it works for me & I never have any skin problems. I use a Dansac one piece with a Dansac seal. I only use water to clean, so when I take my bag off I wipe with wet swabs. Then it properly cleaned in the shower and I just use swabs to dry it and put on my bag & seal. If my skin is a little red I use a bit of powder but it's usually fine.
Diet wise, be careful for the first couple of months. Then when you want to add in new things, do it in small portions and build it up to more if you want, that way you know if it's causing you any problems. And if it doesn't agree with you, don't discount it forever! Try again in a few months! I couldn't eat apples at all for the first year, now I eat them every day, skin & all!
Check with you surgeon about exercise, when you can start & what you can do. I don't think anything should be a problem once you're fully healed and are very careful.
Activities - I've done plenty of things with my ostomy, it shouldn't stop you. Travelling on a plane, holidays, swimming, zip-lining, roller-coasters - all fine with me!
Just take things very slow and be kind to yourself - you will get through it!