As always, it's so much more helpful for you if you put your location in the TITLE of your post! Not everyone reads every post or even receives every post, so if you really want to get noticed by people in your area, put the geographic location in the title and not in the body of the post.
Secondly, do we really need to get so snarky on this board, back and forth with accusations and insults. I don't think you need to call people stalkers on a public board - it's very common to go back and check prior posts to remind ourselves of who a questioner is and what their prior issues have been. I don't think some of the answers need to be so cruel, but you do have to admit it's odd to see you talking about a 2.5 year old daughter having tantrums in October and now you want help planning a party for your 3 year old son in April or March. If there are twins, then say so because you'll be planning 2 parties, right? If you don't have a shared birthday party and want separate ones for each child, that's fine. But if they aren't twins, then there clearly are huge discrepancies here, and no one wants to spend time answering questions that are less than honest or forthcoming.
Personally, we NEVER used venues for toddler birthdays. I think big parties for children that age are overwhelming for the birthday child as well as the invited children. The guests aren't old enough to understand that they have to give a toy to the birthday kid and they can't have one themselves or play with it. Some kids just really can't handle crowds and overstimulation. None of them "get it" so it's almost always a headache. Since your daughter was prone to tantrums, you might want to think about putting her in a stressful situation. You will need your husband to help manage any party, and if she is not inclined to accept his discipline. I don't know how your son is, but I'm assuming that your daughter would at least be invited to the boy's party. Big parties are difficult for 6 and 7 and 8 year olds, and they're almost impossible for 3 and 4 year olds. That's why home parties are really the easiest - don't invite every single relative, don't invite the entire preschool class, just have cupcakes and sing "Happy Birthday" and wear some party hats and be done with it. Clean-up isn't much with a small group. Otherwise, since you live in Florida and have the advantage of good weather, go to a playground. Do it at a time of day when the kids aren't going to be so overtired and need naps, have a very small picnic, and let them run around on the slide and climbing structures. Take a few pictures and go home before everyone melts down. The other parents will totally appreciate you holding this to a 1.5 hour party and not having a ton of structure or activities other than what the kids create themselves.