I like to get the exp boost from stacking quests, whether solo or in groups. TS offers some good opportunities with this! Mobs that have quests that stack up well include: antelope, crabs, plains snakes, beetles/steppe beetles, griffawns/griffons, sirens, giants, centaurs, gnolls, skelletons/undead. After you hit level 20, check for stacking with writs, Spindlecog helm, AQ6 especially. Many single target quests are avaiable in TS that stack up well with these.
Some examples that can be sorted through to match your day's plans:
Trapper Borgus: (Hunting for Trapper Borgus, entry road from Antonica) crab-beetle-antelope-snakes
Barb on Docks (Working the Docks) (Note: learn Halasian in Graystone first): crab-antelope-snake
Holly Rowan (Helping Holly Rowan, Thundermist Village): giants-gnolls-skelletons-sirens
Turgan (Bridge Keep Threats - on Bridge, also needs Halasian, go this 3x will also give you ability to open bridge doors at night): giants-centaurs-skelletons-gnolls-sirens-griffons
Recycling the Old Fashioned Way (Thundermist Village) highland hunters-sirens-antelope
Doubling/Tripling up adds a few percent exp and a bit of cash for every finished quest - not a lot, but if you are killing this stuff anyway...