Hey justagirl,
I think it might be helpful if you posted the duration of your trip to Orlando, the general area of Orlando you are staying in, etc. If you are close to someone geographically and the timing is right, you may be able to drop in on a dive day-trip with someone. Be careful about your expectations though - If you are here for two days and need to fit your dive into a slot between a theme park on Saturday and the beach on Sunday afternoon you might be trying to do too much. Also, do you have gear that you are bringing along, or do you need to rent? Make sure you bring your c-card and try to make arrangements ahead of time.
The diveshops you are close to will make a difference also and you might be able to tag along with someone to nearby (2-3hours) dives. There are cool dives on both coasts, and at the springs North of Orlando in Central/NorthCentral FL.
There are a few of us here in Orlando/Kissimmee area that don't mind a passenger/dive buddy tagging along, and some of the dive shops are a good hookup (Diver's Direct, Kissimmee Pro Dive, etc). Some shops have trips scheduled that if you sign up for the trip one of the attendees might be willing to give you a ride for a share of the gas money.
Just be careful about bouncing off with someone you don't know though:
twenty-something girl alone + unknown companion + new to the area = possible milk carton picture. The world is full of cancers and caution is warranted.
There are a lot of cool people on this board and some are more than willing to go a little out of their way to help a fellow diver out. Just make sure you get some type of referral (e.g. on this board) about your companion before you get into a van with taped off windows. Also, if you make arrangements, make them very public by posting them to this board, including the name of the person you are going with departure date/time and return date. Also, keeping everything public can diffuse a possible situation with a girlfriend/wife for us male divers, Thank You Very Much
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Just be careful and make sure the arrangements and expectations (its a dive, not a date) are stated up front, especially if your companion is male. I have a daughter, and I am sure your parents don't want to worry or to have to deal with a missing daughter - don't put that on them. Don't mean to be rude, just blunt. If it saves you trouble then we are all better for it.
Good luck with it though - Given the right conditions, I am sure you will find a buddy while you are here. This is a great and friendly group and there are a lot of cool places here.
Cheers!