It is possible they were matting like little bunnies on you, it's also possible they just wanted a time out from the girls. IF it was day time/ you had the lights on then not surprising, they are nocturnal.
I find that mine come to the surface alot as well, however when ever I notice them they are either going for the floating plants (dear god they love the pennywort!) or they are just sitting at the surface hiding in the shell. Mine do this because the girls are swarming around them and lets face it, hiding for an hour is better than potentially nipped antennae.
Periods of inactivity, especially in the day are normal. Apple snails will lay their eggs above water, but you will notice it. Depending on the species the colour differs, but in most it'll be a pinkish or coral looking colour. IF you want them to hatch then just leave them. Applesnail.net has lots of great info, as well as a discussion board about the cute critters.
With apple snails, apparantly the different species will mate, but the won't successfully breed. Having said that, being a different colour does not mean a different species. Two different coloured snails of the same species will breed, and youll get a variety of offspring, the colours a mix of the parents (I believe ivory is an exception, that this colour is recessive and will get just ivory).
Yep, been researching these alot lately.