On Friday I was able to do some testing of these F2P limits.
Grouping with someone higher works if they initiate the group, however I can't get them to summon me to Dalaran because the F2P accounts don't have Wrath.
I can use a 2 character mount, the lovely Candlewaxx flew me down to STV to do some fishing. I can swim from Yojamba Isle to Booty Bay without getting any XP and only dying once I get to Booty Bay due to the vengeful fish. However, fishing training costs 1g for the next training level, or 90s if I get it in SW.
I currently have around 50s. And I need all I can get to get me to 10g for god's sake.
I did the fishing daily in SW and got myself the weatherbeaten journal and then the 'Fish don't leave footprints' achievement. SO another 10 points for that but still no closer to the 10g and 50% into level 10. I'm starting to doubt that I can do this.