Is your bf's mom aware of your healthier lifestyle change?
Unless she's forcefeeding you on your trip, you will have choices over what you put in your mouth
. You are on vacation though so don't be so hard on yourself. Enjoy it!
There are healthy choices at both parks with sandwiches, fresh fruit, salads, popcorn (if you need something to snack on). If you are sitting down at the nicer restaurants (there are some amazing ones in the parks!), there are always healthy choices on the menu!
Drink lots of water because it's really hot in Florida right now.
You'll get PLENTY of activity walking around the parks because that's how I spent 3 weekends of May at Universal and Disney.
I maintained or gained 1 lb ... all of which was totally reversable. It's hard because there is temptation everywhere so I understand the stress you are experiencing (I had the same ones) but you just have to allow yourself to be human. Pick and choose what you really want to splurge on and savor every bite. Mine was gelato at Epcot!
Tropicana Field is a harder place to be healthy but try to eat before you get there. They have nuts as a snack
but it's pretty calorie dense. I remember when I was there I shared a hotdog with my bf and a diet soda.
Have fun on your trip.