Can we bring our own tubes to use on the river??

We take our own tubes down the river all the time, you have to find your own spot to get in and have someone pick you up. The canoe liveries don't pick you up unless you are renting their equipment. I also work at Mohican Adventures.

Yes

There's a place to put in on Rt 3 that's not owned by the campground. There is a very small area there to park in.

I've never seen it but then again we don't leave Mohican Adventures. Gotta be somewhere else to jump in besides there.