さて、そろそろ帰らなければなりません。楽しかったです。

Well, I'm afraid I must be leaving. I had a nice time.

さて、そろそろ帰(かえ)らなければなりません。楽(たの)しかったです。

Sate, sorosoro kaeranakerebanarimasen. tanoshikatta desu.

偖 (さて)

well; now; then

そろそろ (そろそろ、そろっと)

slowly; quietly; steadily; gradually; gingerly; soon; momentarily; before long; any time now

帰る (かえる)

to return; to come home; to go home; to go back; to leave; to get home; to get to home plate

楽しい (たのしい)

enjoyable; fun

です (です)

be; is

Readings: キ、かえ.る、かえ.す、おく.る、とつ.ぐ

Meanings: homecoming, arrive at, lead to, result in

Readings: ガク、ラク、ゴウ、たの.しい、たの.しむ、この.む

Meanings: music, comfort, ease