maybe -- me la he pasado soñando en practicar kayak, or----------- he estado soñando con practicar kayak as far as i know the verb plus ING has a lot of meanings - to describe an action which is happening around this moment -to supply or replace the infinitive like i like to swimm--- i like swimming -to describe how is an action -- like-- I've been dreaming of kayaking- in spanish we just use gerund to describe an action which is happening around this moment just that we don't supply or replace the gerund(present continous) for the infinitive, never try to swicht them, always use the infinitive= to dance, to run, to swimm and in spanish to describe how is an action, we don't do this-------- me gusta nadando we always do this--------- me gusta nadar or me gusta practicar natación i don't know if this info is useful but i tried to explain it, :) good luck

"Soñé que hacía kayak" or "Estuve soñando que hacía kayak", both are fine, but the last one is kinda formal, and it may denote it was a regular dream or something :)

he estado soñando de hacer kayak

"He estado soñando haciendo kayaking"

Yo siempre he soñado con hacer Kayak or Yo siempre he deseado hacer Kayak y literalmenete Yo he estado soñando con hacer Kayak ( pero así no se usa en Españols)