Is a $50 gift card good enough

Hello all May 15 bride here so excited but at the same token in a huge dilemma. Here it goes we are eloping just the 2 of us and 1 family friend with his sister will be our witnesses. we currently don't have any other support sadly but anyways here's my situation we are eloping at the beach taken some photos there with them and taking additional photos at a botanical garden 40 min away ALONE for another hour. I discussed this with my photographer tonight, and she suggested it's best not to eat in between because God forbid is anything gets spilled on us the additional photos would be ruined. my FH is wearing all white tux and I'm wearing white. Sounds good right the problem is what are my 2 guests gonna do during that time while we are away taking photos? I hope this doesn't sound too tacky but would it be bad or crazy to give them a thank you bag with something nice inside and edible along with a $50 gift card for dinner for them attending because they drove a hour and a half to attend? They already know it's an elopement. I just wanna show gratitude.