Ideas for kind gestures?

Hello! I have a few people in my life who have been so generous and supportive of me, and I really want to do something to return the love but I'm not super creative. 🙁

My SIL has three toddlers and is always having us over for play dates and feeding us lunch (we only had one kid until 3 weeks ago and these are her only cousins). I know that works well for her since she's used to feeding a lot of people and would rather not take them all to our house. But she always turns me down when I offer to bring lunch, and she has other family that babysits and stuff so I'm not sure how I can really provide something valuable. Now she insisted on turning our next play date into a little second birthday party for my daughter and won't let me bring a cake lol. Any ideas?

My good friend is married but not having kids, and she's always making us food and being so thoughtful. Last night she came over in the evening to hold my newborn and let my husband and I sleep. I don't feel like I have time to cook stuff for her (and she's a way better cook). Her 30th birthday party is this weekend and we might not make it because we haven't been sleeping much. I was already planning to do something extra with her when I can be away from the baby longer but I don't have any ideas. She's not very feminine so no manicures or anything.

I just want to show them how much I appreciate them but feel disadvantaged because I don't have time to really think of something great. Any suggestions are welcome. 💕